Abbey Helped Greyson Study for an Important Exam for About

Multiple Choice

Abbey helped Greyson study for an important exam for about 8 hours. After Greyson got an "A" on the exam, he told Abbey , "I will give you $25 for helping me get a good grade." Abbey said, "Thanks, I'll take it." There is:

A) no contract because there is no mutual assent.
B) no contract because there is no valid consideration.
C) no contract because $25 is not adequate consideration for 8 hours work.
D) a contract with sufficient consideration.