Dave's Hobby Town and Estelle's Yarn Shoppe Are Adjacent Stores

Dave's Hobby Town and Estelle's Yarn Shoppe are adjacent stores with adjoining parking lots. Dave offers Estelle a discount on purchases from Dave's store if Estelle will not tow the cars of Dave's customers who park in Estelle's lot.
-Refer to Fact Pattern 12-1.Estelle's forbearance from towing is legally sufficient consid-eration

A) because it is a promise of something of value.
B) only if Dave's customers park in Estelle's lot.
C) only if Estelle's customers cannot park in her lot because it is full.
D) under no circumstances.