. . . . . . . . involves a continuous flow of instructions, comments and suggestions from the manager to the subordinate.

The correct answer is: A. Coaching.

Coaching is a process in which a more experienced person helps a less experienced person to improve their skills and knowledge. It involves a continuous flow of instructions, comments and suggestions from the manager to the subordinate.

Understudy is a person who is learning a job by watching and helping someone who is already doing that job.

Behaviour modelling is a technique used to teach people new skills by showing them how to do it and then having them practice it.

None of the above is a correct answer.