Andy: "This Is to Confirm Our Telephone Conversation of Earlier

Andy: "This is to confirm our telephone conversation of earlier today. 200 lbs. of T-bone at $2.89 per pound." Barb: "Yes, but that's 100 pounds at $2.99."
Andy: "Too late, we already reached agreement by phone."
Barb: "Too bad, it wasn't in writing."
Which of the following statements is true?

A) Barb is incorrect. The phone conversation was a contract.
B) Barb is correct. The agreement must be in writing to be enforceable.
C) Andy can enforce the agreement with the parol evidence rule.
D) None of the above