Answer:
The answer is option option A) The principle of social influence explains this phenomenon best is the principle of Reciprocity.
Step-by-step explanation:
The principle of reciprocity is a popular social law of psychology that portrays the need to give to get.
It states that "in many social situations we pay back what we received from others".
Every body has a need. even the potential donors with all their wealth need validation every now and then
Therefore, taking on a reciprocity approach by the American Cancer Society by adding pre-printed address labels personalized as a gift to the receiver of the solicitation met the need for validation among potential donors which made their donation levels go up by 30%.