Jack runs a company and is constantly under pressure. When he went to the doctor recently, he was advised to engage in aerobic exercises that would make his heart pump faster and therefore function more efficiently.

C. Hypertension

Explanation:

Based on the information provided in this scenario it is safe to say that Jack was most likely diagnosed with hypertension. This is a condition in which the force of the blood against the individual's artery walls is too high. Aerobic Exercises are encouraged since they can actually keep the blood flow normal and maintain normal blood flow levels thus keeping the hypertension at bay.