给下列句子选择正确的答语。
（   ）What are you doing?                    A. Yes, they are.
（   ）Is her birthday in June?               B. It's May the 5th.
（   ）What's the date?                       C. I'm answering the phone.
（   ）What do you do on the weekend?         D. Yes, it is.
（   ）Are they doing an experiment?          E. I often go hiking.