A: I’m much grateful to you for everything you’ve done for me.
B: ().

A. Forget about it.

B. That’s all right.

C. I’m pleased to be at your service.

D. You are very welcome to visit our country.

属于市场营销调查的步骤有（）。

A、调查准备阶段

B、调查实施阶段

C、分析与研究阶段

D、撰写调查报告阶段