Fact Pattern 12-A2 (Questions A8-A10 Apply)

Multiple Choice

Fact Pattern 12-A2 (Questions A8-A10 apply)
Cut-Rate Construction Company (CCC) begins building a restaurant for Diners Restaurants,Inc.,but after two months demands an extra $100,000.Diners agrees to pay.
-Refer to Fact Pattern 12-A2.If CCC offers,as a reason for the extra $100,000,that ordinary business expenses have increased,the agree?ment is

A) enforceable as an accord and satisfaction.
B) enforceable because of unforeseen difficulties.
C) unenforceable as an illusory promise.
D) unenforceable due to the preexisting duty rule.