Sonny Is Buying a Computer System for His College's Administrative

Sonny is buying a computer system for his college's administrative functions.The negotiated price of the system is $475,000.He receives a contract for $375,000 with no explanation as to the change and gladly signs it and sends it back to the vendor.He receives a phone call from the vendor explaining that the secretary in typing the figures into the contract hit the 3 instead of the 4 on her keyboard.Sonny wants to hold the vendor to the contract.Is the contract legally binding on the contractor?

A) Yes,because it constitutes a written offer.
B) No,because of a lack of genuineness of assent on the part of the vendor.
C) Yes,because of the law of agency covers the secretary as well as the salesperson.
D) No,because this constitutes a mistake of fact that Sonny should have immediately recognized.