Amos owned Greenfield, a tract of land. His friend Bert wanted to buy Greenfield and offered $20,000 for it. Amos knew that Bert was insolvent, but replied, "As a favor to you as an old friend, I will sell Greenfield to you for $20,000, even though it is worth much more, if you can raise the money within one month." Bert wrote the following words, and no more, on a piece of paper: "I agree to sell Greenfield for $20,000." Amos then signed the piece of paper and gave it to Bert. Three days later, Amos received an offer of $40,000 for Greenfield. He asked Bert if he had raised the $20,000. When Bert answered, "Not yet," Amos told him that their deal was off and that he was going to accept the $40,000 offer. The next week, Bert secured a bank commitment to enable him to purchase Greenfield. Bert immediately brought an appropriate action against Amos to compel Amos to convey Greenfield to him. The following points will be raised during the course of the trial. I. The parol evidence rule. II. Construction of the contract as to time of performance. III. Bert's ability to perform. Which will be relevant to a decision in favor of Bert? 
I only. I and II only. II and III only. I, II, and III. 