It's helpful to put children in a situation they can see themselves differently.A. that D

问题补充：

Its helpful to put children in a situation they can see themselves differently.

A. that D

B. when

C. which

D. where

答案：

A. that D

B. when

C. which

D. where

解析：a situation在定语从句中作状语，故答案为D。