这个句子里面，包含一个“强调句”，选B。

Can you tell me what it is that makes people love this city so much?

这个强调句拐了很多弯，我给演示一下怎么来的：

1. It is the good environment that makes people love this city so much.

2. 句1 是个强调句，就换线部分提问，得到：

What is it that makes people love this city so much?

3. 让 What is it that makes people love this city so much? 成为 Can you tell me 的宾语从句，得到：

Can you tell me what it is that makes people love this city so much?