On March 1, Betty sent Barney an email offering to sell Barney her car for $10,000, with the payment and delivery to take place on March 31. Because the email went into Barney's spam file, Barney did not see the email until March 4. The last paragraph of the email stipulated that Barney should let Betty know whether Barney would accept her offer for the car as soon as "reasonably possible," provided that Betty would keep the offer open until March 15. On March 10, Barney mailed a letter to Betty accepting Betty's offer to sell the car. However, on March 13, Betty called Barney and revoked the offer. Betty then sold the car to Dino. Betty received Barney's acceptance letter on March 14. Barney sued Betty for breach of contract.

What are Barney's best arguments in support of his claim for breach of contract?

What are Betty's best arguments in defending against Barney's claim?