Given the question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "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."?
The answer is:
Where was Buddha most practiced?