Noadays, more and more young couples are childless ______ choice

Noadays, more and more young couples are childless ______ choice.
A、with
B、by
C、out of
D、because of
【正确答案】：B
【题目解析】：本题考查关于choice的词组辨析。with choice,because of choice带入句中无意义，故排除A和D。by choice：出于自己的选择，自由地；没有out of choice用法。答案为B。