Bobs mother would like him to go to school so he enrolls at the University of Iowa. He also quits his job and tells his mother his plans to continue taking classes. His mother says, Im so happy that you are going to college that I want to pay for your books. Bob then sends her a bill for $1,000. Which of the following is true regarding his mothers promise? Group of answer choices A. It is enforceable because Bob returned to college. B. It is enforceable because Bob is giving up the right to do something else. C. It is unenforceable because it is a unilateral contract. D. It is unenforceable because Bob has