Idioms and Phrases - Verbal and Reasoning

In the following questions four alternatives are given for the idiom/phraseitalicised and underlinedin the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
Q1:

He never liked the idea of keeping his wife under his thumb and so he let her do what she liked.

A Pressed down

B Unduly under control

C Below his thumb

D Under tyrannical conditions.

ANS:B - Unduly under control

No answer description is available.