Final answer:
Under the UCC, preexisting contractual duties can be modified without new consideration and without requiring court approval.
Step-by-step explanation:
Under the Uniform Commercial Code (UCC), modifications to preexisting contractual duties do not always require new consideration to be enforceable. Option a is false. While new consideration can strengthen the enforceability of a modification, the UCC allows modifications to be binding even without new consideration.
Option b is also false. Modifications to preexisting contractual duties do not require the approval of a court to be enforceable under the UCC. As long as the parties mutually agree to modify the contract, the modification can be valid.
Option c is partially true. Although not all modifications must be in writing under the UCC, there is a requirement for a modification to be in writing in certain situations to be enforceable. For example, when modifying the sale of goods contract involving a value of $500 or more, the modification must be in writing to be enforceable. Therefore, option c is not always true.