Doc worked at Hackettstown Hospital for 30 years. Upon announcing his retirement, Doc's boss tells him, "You have always gone above and beyond for the hospital and for your patients. In recognition of all your past work, we are going to give you a $10,000 bonus." However, the hospital subsequently hits hard financial times and they inform Doc that they are no longer in position to award him the bonus. Doc sues the hospital for $10,000.

Which argument below is the hospital's BEST defense?

a.

The contract was not in writing.

b.

There was no contract due to a mutual mistake of fact

c.

Past services cannot be the basis for contractual consideration

d.

The offer lacked enough detail to be valid