Question

Why is the answer D?

Answer 1

True to is your answer, because it is referring to the Parsi tradition, which means that they follow the tradition to the dot, which makes it "true", as they are virtually the same.

Therefore, true to is your best answer choice

hope this helps

Answer 2

You can't leave it the way it is. In regarding is a participle that is the object of in. It refers back to nothing at all, nor does it modify anything going forward. It is just bad grammar. A is wrong.

There hasn't been an account. There are just examples of how Hindi films work. B is not your best answer.

During is a time element. It doesn't work either. You would need something like "During this time .... "

D works because it says that there is a tradition to be followed from the first sentence.