The correct answer is B) Emperor Ashoka.
The individual that helped spread Buddhism to areas outside of India was Emperor Ashoka.
Asoka was the grandson of Chandragupta, who was the founder of the Mauryan Dynasty. Asoka assumed the throne in 268 BC. After a bloody battle against the territory of Kalinga, Asoka turned into Buddhism. In order to spread Buddhism everywhere, he ordered the construction of monasteries and temples where Buddhist teachings were written in the walls.