Rays of heat that conduct the energy.
Buddhism led to the spread of Indian empires because for the first time in Indian history, India had a common ground to unite under and this led to India becoming stronger as a nation. India was able to have most of its architectural feats that are now renowned during this time because of religion.
I selected D on my quiz and scored a 100%
After analyzing you question I have come to the conclusion that the answer is in-fact, Answer: D