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.