Now she is considering taking some weight-loss pills she thinks will help her become sli

问题补充：

Now she is considering taking some weight-loss pills, she thinks will help her become slim.

A. which

B. that

C. what

D. who

答案：

(答案→)A. which

B. that

C. what

D. who

解析：通过分析句子结构，可知这个句子中包含一个非限制性定语从句，关系词在定语从句中作宾语，且是物，故用which。