The next seven questions pertain to this hypothetical: Mr. Adams calls Jack into his office at school and says, "I know that you're really short on money. If you want, you can come over sometime and really fix up my lawn; you know, cut the grass, trim, weed the garden, and prune the bushes. I have all the equipment on my patio. All you have to do is come over and get to work. OK?" Jack replies, "How much are you gonna pay me?"Mr. Adams says, "How 'bout $75?"Jack blandly says "oh" and walks out of the office.Mr. Adams yells, "Hey, wait! Do we have a deal or not?" Two weeks later, Jack shows up at the Adams' home and spends nine hours fixing up the lawn. The Adams's, who are in Chicago for the weekend, come home just as Jack is finishing up. Mrs. Adams exclaims, "Boy, the yard really looks good! You've done a good job!" Mr. Adams says, "Yeah, the yard looks great. But, when you just walked out of my office, Jack, I assumed you didn't want the job, so I offered it to Bill. Bill's rearranged his woschedule so that he can come over tomorrow to do the yard. I'm sorry, Jack, but I've promised the job and the pay to Bill. I can't, in good conscience, pay you!" The court finds that there is no contract between Jack and Adams. Why?

the offer was vague and non-specific.

the offer was terminated by Jack's silence.

the parties lacked the capacity to contract.

the offer to Bill terminated the offer to Jack.