D'Sean Promises to Pay His Personal Assistant Edie $50,000 in Consideration

D'Sean promises to pay his personal assistant Edie $50,000 in consideration of the services she provided over the years. D'Sean never makes the payment. D'Sean's promise is

A) enforceable for the entire $50,000.
B) enforceable to the extent of what Edie's services were actually worth.
C) not enforceable because the consideration is in the past.
D) not enforceable because the failure to pay is an unforeseen difficulty.