Q. Their boss has them all completely . . . . . . . . her thumb. They are really scared of her.
✅ Correct Answer: (A)
under
Explanation: 'Under someone's thumb' means 'completely under someone's influence or control'. Hence it makes the sentence meaningful.
Explanation by: Team MCQ Buddy
'Under someone's thumb' means 'completely under someone's influence or control'. Hence it makes the sentence meaningful.