Information:  - Rodney K. "Rod" Millen (born 22 March 1951) is a racing competitor, vehicle designer, and business owner. He has competed in numerous genres of motorsports, including rally racing, off-road racing, hillclimbing, drifting, and super touring.  - British Leyland was an automotive engineering and manufacturing conglomerate formed in the United Kingdom in 1968 as British Leyland Motor Corporation Ltd (BLMC), following the merger of Leyland Motors and British Motor Holdings. It was partly nationalised in 1975, when the UK government created a holding company called British Leyland, later BL, in 1978. It incorporated much of the British-owned motor vehicle industry, which constituted 40 percent of the UK car market, with roots going back to 1895.  - The Rally America National Championship is the national championship of rallying events in the United States. The inaugural season was in 2005. Rally America was also the name given to the organization that sanctioned the championship, was briefly rebranded to RallyCar in July 2010, then reverted to Rally America the following year.  - The Sports Car Club of America (SCCA) is an American automobile club and sanctioning body supporting road racing, rallying, and autocross in the United States. Formed in 1944, it runs many programs for both amateur and professional racers.  - The Audi 80 is a compact executive car produced by the German manufacturer Audi (initially known as Auto Union and Audi NSU Auto Union) from 1966 to 1996. It shared its platform with the Volkswagen Passat from 1973 to 1986 and was available as a sedan, and an Avant (Audi's name for a station wagon). The coupé and convertible models were not badged as members of the range but shared the same platform and many parts.  - John Buffum ( born October 4 , 1943 , in Wallingford , Connecticut ) is the most successful U.S. rally driver ever , winning 11 national titles and 117 national championship events . From 1977 to 1980 , when British Leyland dropped out of U.S. racing , he won both the SCCA ProRally series and the North America Rally Championships . In 1981 , he competed with an Audi 80 and Peugeot 504 , but they were not competitive compared to Rod Millen 's factory Mazda RX - 7 rally cars . In addition to his North American schedule , Buffum cherry - picked rallies in Europe , where he became the first and still the only American to win a European Rally Championship event , taking the 1983 Sachs Rally in West Germany and the 1984 Cyprus Rally , both with Audi Quattro . He also ran the 1969 Monte Carlo Rally in a Porsche 911 . He also helped restart the Mount Washington Hillclimb Auto Race in 1990 . Since the late 1980s , Buffum has owned and managed Libra Racing based in Colchester , Vermont . He has been responsible for building cars for the Hyundai Factory rally programme in the US and has worked alongside Vermont Sports Car on their Subaru Factory programme as a consultant . In 2009 , he built the first open class Mitsubishi Evolution X , to campaign in the Rally America national series and the Canadian Rally series . In 2014 , Buffum was elected to the Vermont Sports Hall of Fame .  - Hillclimbing (also known as hill climbing, speed hillclimbing or speed hill climbing) is a branch of motorsport in which drivers compete against the clock to complete an uphill course.  - SCCA ProRally was an American rally racing series, run by the Sports Car Club of America from 1973 until 2004. The SCCA discontinued it for 2005, due to concerns about safety and insurance. It allowed Rally America to replace it, utilizing most of the same venues and existing infrastructure.  - The Volkswagen Passat is a large family car produced by the German automaker° Volkswagen since 1973, through eight design generations. It is positioned between the Volkswagen Golf (Jetta) and the Volkswagen Phaeton in the current Volkswagen line-up and its derivatives have been badged variously as the Dasher, Santana, Quantum, Magotan, Corsar and Carat. The successive generations of the Passat carry the Volkswagen internal designations B1, B2, etc. which originally ran concurrently with those of the Audi 80 and A4 with which the Passat has shared its engineering platform at certain model generations, although this link has now been severed.    What object entity has the relation of 'sport' with the subject 'john buffum'?   Choices: - golf  - hillclimbing  - rally  - rallying  - united kingdom
A:
rallying