It took him a long time to come round after the operation.

Answer: Option A

recover : return to a normal state of health, mind, or strength.
walk : move at a regular pace by lifting and setting down each foot in turn, never having both feet off the ground at once.
move : go in a specified direction or manner; change position.
eat : put (food) into the mouth and chew and swallow it.
come round: recover consciousness.


Synonym of come round is recover