分式$\frac{x}{3y}$与$\frac{3x}{2y^2}$的最简公分母是（　　）

A: Hi, Ann. What are you going to do this weekend?

B:____

A: A concert? Who will sing at the concert?

B: Song Zuying.____

A: Certainly, I'd like to. She is my favorite singer.____

B: One hundred and eighty yuan.

A: Oh, it's too expensive.____

B: We plan to sell flowers for the money.

A: That's a good idea.____

B: No problem.