Answer:
A. Buddhism was important in India during the Maurya empire.
Step-by-step explanation:
That is the picture of a stupa.
Stupa is a place that is usually used by Buddhist monks as a place of living. A place that help them cutting off the tied with the outside world and focused on their religious journey.
It is often used to house meditation for monks and stored important Buddhist Artifacts. The existence of this type of building indicates that Buddhism is a huge influence in that region.