I know that the answer to the question "Where did Mahayana Sutras spread to second, China or Korea?" is in "In the 2nd century CE, Mahayana Sutras spread to China, and then to Korea and Japan, and were translated into Chinese. During the Indian period of Esoteric Buddhism (from the 8th century onwards), Buddhism spread from India to Tibet and Mongolia.". Can you tell me what it is?
A:
Korea