Which of the Following Describes the Effect of the Knock-Out

Which of the following describes the effect of the knock-out rule?

A) The contract will consist of those terms on which the parties' writings agree plus any different terms that are reasonable under the circumstances.
B) The contract will include the different terms and any appropriate gap-filling presumptions in the Code.
C) The contract will consist of those terms on which the parties' writings agree plus any appropriate gap-filling presumptions of the Code.
D) No contract exists.