Darryl contracted with Right Builders to build an addition to his house for $25,000. After digging the foundation, Darryl decides he wants to have the house done earlier than was originally agreed. Right Builders agree, but say that it will need to charge an additional $5,000 for the job. Assuming Darryl agrees, which of the following is correct?
a. Darryl will only have to pay $20,000.
b. This is a contract under seal which is enforceable.
c. This is the settlement of a disputed debt that requires no additional consideration on the part of Right Builders.
d. This is a modification of a preexisting contract, but Right Builders has provided additional consideration since they are expediting the completion of the project.