Answer:
C) Because the contracts were for amounts priced at $500 or more, they were required to be in writing and signed by the buyer.
Step-by-step explanation:
Under Article 2 of the Uniform Commercial Code (UCC) all contracts for the sales of goods with a value above $500 must be in writing. The fact that Patty sent a confirming memo to her clients which wasn't objected, is not sufficient enough to be considered a written contract since the buyer didn't sign it.
According to UCC rules a contract must be signed “by the party against which enforcement is sought.” The buyer could have requested Patty to perform, but she cannot request the buyer to perform.