Final answer:
The compliance technique used on you was the foot-in-the-door technique.
Step-by-step explanation:
The compliance technique used on you was the foot-in-the-door technique. This technique involves persuading a person to agree to a small request or favor, and then later making a larger request. In this case, the telephone solicitor initially asked you to donate $500 to a Christmas Relief Fund for the poor, but when you expressed shock and declined, they then asked if you would donate $25, a smaller sum that you agreed to give. By getting you to agree to the smaller request, they increased the likelihood of you complying with the larger request.