Which of the following is NOT a reason that will terminate a contract?

Amendment is not a reason that would terminate a contract because amending a contract involves changing its terms while allowing the contract to continue in existence. When parties mutually agree to amend certain aspects of a contract, it typically means they seek to adjust their obligations or rights under the existing agreement, rather than ending it.

In contrast, performance signifies the fulfillment of contractual obligations, thereby concluding the contract. Breach refers to a failure of one party to meet the agreed-upon terms, which can lead to termination. Revocation involves one party withdrawing from the contract before it has been executed, which also results in termination. Thus, since amendment maintains the contract's validity rather than terminating it, it stands as the correct choice in this context.