How does Bollywood have its roots in the Aryan invasion?
a.) The films of Bollywood often are about the Aryan invasion.
b.) Bollywood uses the caste system in the way it employs people to make films.
c.) Bollywood films are often about the epic poems of ancient Hinduism that developed from local and Aryan religious beliefs.
d.) Bollywood is based in Mumbai, the center of the Aryan invasion.

I think it might be d. I have a big feeling it's not a, because not all Bollywood films are about the Aryan invasion; some are just about weddings. (I think.)