On April 1, Brad Hammer Hardware sent a letter to Woodshop Tools Mfg. Co. by postal mail in which it offered to purchase 50 hammers at a stated price per unit. On April 3, Woodshop Tools received Brad Hammer Hardware's letter. On that same day, Woodshop Tools sent a properly addressed and stamped letter of acceptance to Brad Hammer Hardware by postal mail. Unfortunately, the letter was temporarily lost by the post office and was not delivered until April 10. On April 9, Brad Hammer Hardware emailed Woodshop Tools that it was revoking its offer. Based on the facts:

A. No contract was formed. B. A contract was formed on April 1. C. A contract was formed on April 3. D. A contract was formed on April 10.