Answer: Controlling
Explanation: The controlling function of the management focuses on comparing the set standards with the actual performance and taking corrective action if there comes any discrepancy.
In the given case, Jerry is reviewing the performance of his subordinates and is analyzing the performance of those who did not achieve the targets. Thus, he is comparing and trying to find the solution on how the underachieving employees could be made better.
Hence, from the above we can conclude that Jerry exemplifies controlling.