As a General Rule, a Promise Must Be Supported by Consideration

As a general rule, a promise must be supported by consideration. Which of the following is an exception to the rule and can be enforced without the support of consideration?

A) A non-charitable enterprise financed by the subscriptions of individuals
B) A promise to refrain from doing what one has no right to do
C) An act performed prior to the promise made by the promisor
D) An obligation of record such as a judgment