Carl Pledges $1,000 to the Disaster Relief Organization (DRO)

Multiple Choice

Carl pledges $1,000 to the Disaster Relief Organization (DRO) . On the ba?sis of the pledge, DRO orders additional rescue equipment. Carl fails to pay. In DRO's suit, a court may enforce the pledge

A) according to the preexisting duty rule.
B) as an illusory promise supported by past consideration.
C) on a theory of accord and satisfaction.
D) under the doctrine of promissory estoppel.