In December,2001,Mark Signs a Written Consulting Agreement for the Period

In December,2001,Mark signs a written consulting agreement for the period of January,2002,through May,2003.The contract is going well,so on June 15,2002,the parties orally agree to extend the arrangement by 4 months through September 2003.In October 2002,the client tells Mark that the 4-month extension will not be honored.Under these circumstances:

A) The extension is unenforceable because it cannot be completed within one year of when the extension agreement was made.
B) The extension is unenforceable due to the parol evidence rule.
C) The extension is enforceable because the period of extension was less than 1 year.
D) The extension is enforceable because of the part performance exception.