Answer:
a. a release
Explanation:
Based on the scenario being described within the question it can be said that the agreement between Brick and Carmen is known as a release. This is a contract or agreement in which the individual accepting, agrees that they have absolutely no claim against the party that is named in the release. Which in this case would be Brick since he is the one that has offered Carmen $2,000 to not pursue any legal claim against him.