大全一道语法

夏雨霏霏

317. Freedman’s survey showed that people living in small towns and rural areas consider themselves no happier than do people living in big cities.

(A) no happier than do people living

(B) not any happier than do people living

(C) not any happier than do people who live

(D) no happier than are people who are living

(E) not as happy as are people who live
选A，为什么是no happier呢