Question

many people prefer a fixed-rate mortgage because it
○ is variable.
○ might go down.
○ is predictable.
○ costs the least.

Explanation:

A fixed - rate mortgage has an interest rate that remains the same throughout the loan term. "Is variable" is incorrect as fixed - rate is not variable. "Might go down" is not a reason to prefer fixed - rate as the rate doesn't change (so it won't go down on its own in the context of fixed - rate, and if rates in the market go down, a fixed - rate holder can't take advantage). "Costs the least" is not necessarily true as fixed - rate might have a higher initial rate than an adjustable - rate in some cases. The key feature of a fixed - rate mortgage is that the payments are predictable because the interest rate is fixed.

Answer:

C. is predictable.