Q. My father will retire from service . . . . . . . . a year.
✅ Correct Answer: (C)
in
Explanation: 'In' is a preposition of time which refers to the duration of something to happen. Hence it makes the sentence meaningful.
Explanation by: Team MCQ Buddy
'In' is a preposition of time which refers to the duration of something to happen. Hence it makes the sentence meaningful.