Contracts That Offer Deals Appearing "Too Good to Be True

Contracts that offer deals appearing "too good to be true" often are just that. However, many people sign them, only to read the fine print after the fact. In so doing, they discover additional charges or limitations to their service or product that were not made clear at the time of the sale. This is an example of

A) door-in-the-face technique
B) foot-in-the-door technique
C) low-ball technique
D) hidden clause technique