Correct option is B
The correct meaning of the idiom “called it a day” is “stopped working on something.”
Given Idiom: Called it a day - To stop working on something, typically because the work is finished or because it is time to stop.
Hindi Meaning: किसी काम को समाप्त करना।
Meaning in context: The idiom suggests that Harvey stopped working on the study after twenty-three years.
Example: After working tirelessly for hours, the team decided to call it a day and resume tomorrow.
Example 2: Once the project was completed, the manager called it a day.