Why Is a Guaranty Contract Similar to a Suretyship Contract

Multiple Choice

Why is a guaranty contract similar to a suretyship contract?

A) Both a guarantor and a surety join the principal in making a promise.
B) Both a surety and a guarantor are primarily liable for the performance of another's debt.
C) Both a guarantor and a surety are secondarily liable for the performance of another's debt.
D) Both a guarantor and a surety agree to answer for the obligations of a debtor.