根据对话内容，在空白处填写适当的话语（话语可能是一个句子，也可能是一个短语或一个词），使对话完整。

A: Hi, Tom.  I'm starting a band.  Do you want to join me?

B: Sure,  Ben.  I'd love to be in a band.

A: OK, good.   1  ?

B: I don't play an instrument.  I sing.  I like music with great lyrics.

A:   2   .  Who else can join our band?

B: Well, there's Dave.  He plays the piano.  But he prefers quiet music.

A: Good.   3   Harry? He plays the guitar, doesn't he?

B: Yes. But Harry loves music that's loud.

A: That's OK.  We can play loud music and quiet music.

B:   4  ?

A: I like music I can dance to.  But there's just one   5   for our band.

B: What's that?A: I'm not a musician and I can't sing.

如果厂商处于完全竞争的产品市场中，且要素A是其唯一的可变要素，则该厂商对要素A的需求曲线由以下何者给出（）。

A.MRP曲线

B.MPP曲线

C.MFC曲线

D.以上都不是