选择题：In those years, a very young mother was not as com

In those years, a very young mother was not as common as it is now.
选择一项：
A. 那些年，年轻的妈妈比现在普遍。
B. 那些年，年轻的妈妈不如现在普遍。
C. 那些年，年轻的妈妈跟现在一样普遍。