一道关于happy用法的选择题

题目

一道关于happy用法的选择题
Most of the retired people are happy ______ their quiet life in the countryside.
A)to B)of C)with D)on
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答案选择的是A,解析说happy后接动词用be happy to do sth；接名词用介词with.我认为their quiet life 为名词,那么找解析来说应该用介词with 为什么选择A呢?希望大家来指导下,

答案

答案绝对错误,应该选C.
sb be happy to do sth 某人很高兴/乐意做某事
sb be happy with...=be pleased/satisfied with...某人对...