给下列问句，选择正确的答语。
（1）Why are you wearing a raincoat?
（2）Why are you here?
（3）Where’s my pen?
（4）Why are you laughing?
（5）Why is he tired?

A．Because I am happy .

B．Because he is playing football.

C．Because it is going to rain.

D．It’s on the desk.

E. We’re going to play hide-and-seek.