Whichof the following idioms given in the alternatives has the meaning?

Explanation:

Turn back the hands of time means to wish to return to the past and change something that has already happened, especially something you regret.

Example:
"If I could turn back the hands of time, I would study harder."

Meanings of other options:

In the fullness of time → Eventually; after enough time passes.
Example: "In the fullness of time, everything became clear."

Turn around time → Refers to the time needed to complete a task (commonly "turnaround time").
Example: "The project has a quick turnaround time."

Arrive somewhere on the stroke of time → Arrive exactly at a specified time.
Example: "He arrived on the stroke of midnight."

Extra Fact:

Many idioms related to time are common in competitive exams:

• Beat the clock → Finish before time runs out
• Against the clock → In a hurry due to limited time
• Call it a day → Stop working for the day
• Once in a blue moon → Very rarely