Ann's Sandwich Shop and Bob's Coffee Bar Are Adjacent Businesses

Ann's Sandwich Shop and Bob's Coffee Bar are adjacent businesses. Ann, whose small shop has little room for her customers to sit, offers Bob a discount on purchases if he will allow her customers to sit at the tables on the sidewalk in front of his store. Bob's forbearance from asking Ann's customers not to use his tables is legally sufficient consideration

A) because Bob has a legal right to restrict the use of his tables.
B) because Ann's customers will undoubtedly use Bob's tables.
C) because Ann's small shop has little room for her customers to sit.
D) under no circumstances.