the one-child policy now most families have only one child.A. Because B. Because ofC. Th

问题补充：

the one-child policy, now most families have only one child.

A. Because B. Because ofC. Thanks for

答案：

解析：Because因为，后面接从句；Because of因为，of是介词，后面接名词或者名词性短语；Thanks for 为了……感谢。For后面接名词或者名词性短语，表示感谢的原因。