What Was the Result of Buddhist Missionary Efforts During the Reign

What was the result of Buddhist missionary efforts during the reign of Ashoka?

A) Despite major efforts, Buddhism failed to spread much beyond the Indian subcontinent.
B) Through the remaining Greek influence in northwestern India, Buddhism spread to the areas affected by Greek culture.
C) Buddhism spread first to Sri Lanka and the Himalayan kingdoms and from there to central and southeastern Asia.
D) Buddhism?s spread was limited to the pastoral nomads of the central Asia steppes.