Given the question: Question: "Which did not spread from India to Tibet, Mahayana Sutras or Buddhism?"  Context: "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."  Answer:
The answer is:
Mahayana Sutras