Assume that Carol Rogers (a local millionaire) pledges to donate $500,000 to the Springfield Humane Society, which the society plans to use to build a new animal hospital. Based on Carol’s promise, the society begins work on the hospital. Carol, however, reneges on her offer. In this case:
a. Carol may be sued for the money based on promissory estoppel.
b. Carol has clearly violated a firm contract.
c. Nothing can be done. Carol's donation was a gift.
d. Carol will suffer from a bad conscience, but not from any lawsuit.