The correct answer is:
A) decrease the monthly payment (P) needed to pay off the debt.
Step-by-step explanation:
When calculating the monthly payment, the interest rate affects the amount you pay.
The higher the interest rate is, the more you must pay monthly in order to pay the debt off within the same number of time periods.
However, if you lower the interest rate, the reverse will be true; you will need to pay less money each month in order to pay off the debt within the same amount of time.