In the following question, four alternatives are given for the idiom/phrase in bold and italics in the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
He never liked the idea of keeping his wife under his thumb and so he let her do what she liked.
Pressed down
Unduly under control
Below his thumb
Under tyrannical conditions.
Correct answer is B
No explanation has been provided for this answer.