Add$-$On Interest Loan. Beth has borrowed $$8,900$ on a four$-$year loan $7\%$ simple interest. Using the simple interest method, her payments would be $$213\mathrm{.}12.$ With an add$-$on interest loan Beth's payment would be: $$ This is a difference of $q,$ per month.

Even though the same interest rate is used for both methods, the add$-$on method is more costly because the interest payment is not reduced over time as Beth pays off the loan. While the interest component of the monthly payment: $($select best answer$)$

A$.$ remains constant using the simple interest method

B$.$ decreases using the simple interest method

C$.$ increases using the simple interest method