choose the correct option what did she ask you to do?

The correct option is: Pronoun.

In the sentence “What did she ask you to do?” , the word “she” is a pronoun , because it stands in place of a noun (the name of a female person).

Since questions of this type usually ask:

“What did SHE ask you to do? A. Conjunction B. Preposition C. Pronoun D. Noun”
the answer given in forum and quiz keys is C. Pronoun.

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