Answer:
A. Missionaries traveled around Asia and taught people about Buddhism.
Step-by-step explanation:
After the Buddha's death, his followers, known as the Sangha, continued to teach his message and spread Buddhism. The Sangha consisted of monks and nuns who devoted their lives to practicing the Buddha's teachings and sharing them with others.
The spread of Buddhism was greatly facilitated by the work of these missionaries who traveled throughout Asia, spreading the teachings of the Buddha to new regions and cultures. These missionaries played a key role in the expansion of Buddhism into many countries, including Sri Lanka, China, Tibet, and Japan, among others.
Therefore, the correct option is A. Missionaries traveled around Asia and taught people about Buddhism.