GPS Devices Inc

GPS Devices Inc.sponsors a "Finders Keepers!" contest in which Erwin and other entrants agree to race to certain locales to win small prizes and collect clues that lead to the "Grand Lost Treasure," which the first finder will be awarded.GPS reserves the right to cancel the contest or change its terms at any time.If Erwin challenges this reservation in court,the court will most likely hold that GPS can

A) cancel the contest or alter its terms at any time.
B) not modify the terms of the contest after it begins.
C) reduce the amount of the small prizes but not the grand prize.
D) reduce the amount of the grand prize but not the small prizes.