Answer: b. a homeowner with a fixed-rate mortgage
Step-by-step explanation:
Inflation erodes the value of money such that $1 today is stronger than $1 a year from now. When mortgage rates are calculated, they take into account the expected inflation rates so that the interest payments will not be smaller than they should be as inflation increases.
If inflation increases more than it was expected to have increased therefore, a person paying a fixed rate would benefit because they would be paying less in effect on account of inflation having made their payments weaker.