When Esther, Gray's 21-year-old daughter, finished college, Gray handed her a signed memorandum stating that if she would go to law school for three academic years, he would pay her tuition, room, and board and would "give her a $1,000 bonus" for each "A" she got in law school. Esther's uncle, Miller, who was present on this occasion, read the memorandum and thereupon said to Esther, "and if he doesn't pay your expenses, I will." Gray paid her tuition, room, and board for her first year but died just before the end of that year. Subsequently, Esther learned that she had received two "A's" in the second semester. The executor of Gray's estate has refused to pay her anything for the two "A's" and has told her that the estate will no longer pay her tuition, room, and board in law school.In an action against Gray's estate for $2,000 on account of the two "A's," if the only defense raised is lack of consideration, Esther probably will
succeed under the doctrine of promissory estoppel. succeed on a theory of bargained-for exchange for her father's promise not succeed, because the $1,000 for each "A" was promised only as a bonus.  not succeed, because Esther was already legally obligated to use her best efforts in law school.
Question: When Esther, Gray's 21-year-old daughter, finished college, Gray handed her a signed memorandum stating that if she would go to law school for three academic years, he would pay her tuition, room, and board and would "give her a $1,000 bonus" for each "A" she got in law school. Esther's uncle, Miller, who was present on this occasion, read the memorandum and thereupon said to Esther, "and if he doesn't pay your expenses, I will." Gray paid her tuition, room, and board for her first year but died just before the end of that year. Subsequently, Esther learned that she had received two "A's" in the second semester. The executor of Gray's estate has refused to pay her anything for the two "A's" and has told her that the estate will no longer pay her tuition, room, and board in law school.In an action against Gray's estate for $2,000 on account of the two "A's," if the only defense raised is lack of consideration, Esther probably will
A. succeed under the doctrine of promissory estoppel.
B. succeed on a theory of bargained-for exchange for her father's promise
C. not succeed, because the $1,000 for each "A" was promised only as a bonus. 
D. not succeed, because Esther was already legally obligated to use her best efforts in law school.
Answer: