Sports Bar and Tasty Bakery Are Adjacent Businesses with Adjoining

Sports Bar and Tasty Bakery are adjacent businesses with adjoining parking lots. Sports Bar offers Tasty a discount on purchases if the bakery will not tow the cars of Sports Bar's patrons who park in the bakery's lot. The discount is legally sufficient consideration

A) because it is a promise of something of value.
B) because on acceptance, it will become a preexisting duty.
C) because the offeror considers it to be adequate.
D) under no circumstances.