Answer:
B. to make consistent
Step-by-step explanation:
Stabilize is a verb that implies that a condition or a situation is not likely to change at least for a given period. In another word, it means that a situation is stable or maintains stability over a certain period.
Therefore, in this case, the word "stabilizes" equates to or means that "to make consistent."
The statement can be rewritten as "One of the many advantages to a balanced budget is that it makes interest rates consistent."