Fact Pattern 21-1 Petro Oil Refinery Asks Quality Bank for a Loan to a Loan

Multiple Choice

Fact Pattern 21-1
Petro Oil Refinery asks Quality Bank for a loan to increase its oil inventory. Quality requires Robin, Petro's president, sign a personal guaranty to pay the debt if Petro defaults. Meanwhile, to sell fifty barrels of refined oil to Slick Lubricants, Inc., Petro asks its outside accountant Tina to co-sign a credit application.
-Refer to Fact Pattern 21-1. If, after the loan agreement is signed, Slick agrees to a higher rate of interest without telling Tina, then Tina is​

A) ​discharged from the agreement.
B) ​liable at the higher rate of interest.
C) ​liable at the lower rate of interest.
D) ​liable for the principal only.