Petro Refinery asks Quality Bank for a loan to increase its inventory. Quality requires Roma, Petro's president, to sign a personal guaranty to pay the debt if Petro defaults. The guaranty is required to be in writing because:
A) the main purpose rule applies
B) the main purpose rule does not apply.
C) the debtor has a right of redemption.
D) the co-signer has a right of contribution.
