[Used Car Sales] Edwin Sells Used Cars

[Used Car Sales] Edwin sells used cars. He is looking for a way to increase sales and profits so that he can take his girlfriend on a nice diving trip to the Grand Cayman Islands. The first thing that Edwin does is say that during the first week of December, he will give a $500 rebate on used cars that are under two years old. To spice things up, he also offers to sell any car on the lot that is over five years old for $1,000 to the first three customers who can jump rope for ten hours straight on December 7th. Edwin was not very concerned about the jumping rope issue because he thought that no one would be able to jump rope for ten hours straight. Edwin put an advertisement pertaining to the rebate and the jump rope opportunity in the local newspaper. The promotion went over very well. Although Edwin had several cars available, he ran out of cars under two years old within one day. During the rest of the week shoppers were told that cars of that description were no longer available. Josh was very angry at Edwin for not having a car available that was under two years old so that he could get a good deal and a $500 rebate. On December 7th, while Edwin was watching people jump rope, Brandi was shopping for a car. She was in college and did not have much money. She saw one, an older car, a real clunker, that she liked; but wasn't sure if it could be repaired sufficiently to be dependable. Edwin had not even put a price on it because he planned to have it crushed. Brandi was going to talk to her parents about it. Edwin eventually approached her, and Brandi asked him if he would take $450 for the car. Edwin said, "Yes, sold." Brandi tried to explain that she needed to talk to her parents first, but Edwin would not hear of it. While Edwin was still fuming from his encounter with Brandi, Zack walked up and started to criticize the nature of Edwin's inventory. Edwin told him that he had great cars. Zack pointed at a beater that was banged up, had 200,000 miles on it, and a cracked windshield. Zack said, "Sure, I'll pay $100,000 for that car!" Edwin said, "Sold." Zack said, "Wait a minute. I was only kidding." Edwin said, "No way." Meanwhile all the people jumping rope dropped out well prior to ten hours except for Emma. She completed the jumping rope and asked for her car for $1,000. Edwin refused saying that the offer was revoked. Josh and Emma sued Edwin, and Edwin sued Zack and Brandi. Under the applicable law in Edwin's state, common law will be applied, and there are no state statutes impacting the situation.
-What is the most likely result in the lawsuit brought by Edwin against Zack?

A) Edwin will win because Zack properly made an offer that Edwin accepted.
B) Zack will win because he was merely expressing possible interest.
C) Zack will win because Edwin did not properly accept.
D) Zack will win because under a subjective standard he was joking.
E) Zack will win because under an objective standard, it appears he was joking.