A person weakened by illness or old age is persuaded by B, who is acting as his medical attendant, to consent to pay B an excessive amount for professional services. What kind of influence does B exert in this situation?

Explanation

In this scenario, B, as the patient's medical attendant, takes advantage of the patient's weakened condition to obtain agreement for an unreasonable payment. This demonstrates that B is exercising undue influence over the patient.