what best determines whether a borrowers interest rate on an adjustable rate loan goes up or down? a fixed…

Brief Explanations:

Adjustable - rate loans' interest rates are tied to market - based indices. Market conditions like economic growth, inflation, and central bank policies influence these indices, thus determining whether the borrower's interest rate goes up or down. A fixed interest rate is not relevant as it doesn't change. A bank's finances and a person's finances don't directly determine the movement of an adjustable - rate loan's interest rate.

Answer:

C. a market's condition