Question: Information:  - Rugby union in Spain is a growing team sport. As of 2014, there were 51,123 registered rugby union players in Spain, playing for 221 clubs in various divisions. The governing body for rugby union in Spain, the Spanish Rugby Federation (Spanish: Federación Española de Rugby), founded in 1923, joined the International Rugby Board in 1988. It is also a member of FIRA.  - The Copa del Rey de Rugby ( previously known as Campeonato de España de Rugby ) is the national rugby cup . The competition was founded in 1926 and , currently is the second most important competition after the División de Honor de Rugby .  - The División de Honor is the top club competition for rugby union in Spain. The league began in 1953 and consists of ten teams. Clubs are relegated to and promoted from División de Honor B. The winner each year qualifies for the European Challenge Cup, the second-tier European rugby competition.    After reading the paragraphs above, we are interested in knowing the entity with which 'copa del rey de rugby' exhibits the relationship of 'sport'. Find the answer from the choices below.  Choices: - rugby  - rugby union  - sport
Answer:
rugby union