Marys mother agrees to give her a new car if Mary maintains anA average for her

Marys mother agrees to give her a new car if Mary maintains anA average for her senior year of college. Mary does in fact earn anA average but when she asks for the car Marys mother tells Marythat she just told Mary that to motivate her and she will not begetting a car. Mary sued her mother alleging a breach of contract.Who will win this suit?a. Marys mother wins because there was noconsideration for her promise.b. Marys mother wins because Mary had apreexisting obligation to do her best.c. Mary wins because her actions in reliance uponher mothers promise constitute consideration.d. Mary wins but only if she can prove that thefair market value of the time she spent studying was equal to thevalue of the car.