Final answer:
In the scenario provided, Simpson Company's acceptance of a six-percent discount instead of their preferred eight-percent discount from Cornwell Manufacturing is an example of a concession, which is a common tactic in negotiations. Option a.
Step-by-step explanation:
The situation described with Simpson Company negotiating with Cornwell Manufacturing and agreeing to a lower discount than desired is an example of a concession option a. A concession in negotiation terms is when one party agrees to a demand or term of the other party that is less favorable than what they originally sought, in the hope of gaining a more desirable outcome later on in the negotiation process. This strategy can be a part of a larger negotiation plan where each side gives and takes to ultimately come to an agreement that is satisfactory to both parties.