The student said,”I am doing my homework.”

The correct answer is C. The student said, “I am doing my homework.” This means that the student is currently doing her homework. She is not finished with it yet, but she is working on it.

Option A is incorrect because the student did not say that she was doing her homework in the past. She said that she is doing it now.

Option B is incorrect because the student did not say that she has been doing her homework for a long time. She said that she is doing it right now.

Option D is incorrect because the student did not say that she has already done her homework. She said that she is doing it now.