Edwin, Marketing VP of Amalgamated Sales, Inc., writes a letter dated August 1 to Bargain Stores, Inc., offering to sell candy to Bargain Stores at $50 per case for the next one month. In mid August, Amalgamated receives an offer from Dandy Stores, Inc., to purchase this candy at a price of $75 per case. Can Amalgamated withdraw its offer to Bargain Stores?