Final answer:
The correct answer is D) Acceptance. Performance, consideration, and offer are all essential to the formation of a contract.
Step-by-step explanation:
The correct answer is D) Acceptance. All of the other options listed are essential to the formation of a contract. Performance refers to the fulfillment of the terms of the contract by both parties. Consideration is the exchange of something of value between the parties for a mutual benefit. The offer is the proposal made by one party to another, indicating an intention to enter into a contract.