Answer:
B. Changes in response to a change in volume, but not proportionately.
Step-by-step explanation:
A semi variable cost (or mixed cost) is a cost or expense that is partially fixed (does not change according to production output) and is also partially variable (changes according to production output). An example of semi variable costs are utilities which have a fixed minimum level per month and they increase as production output increases. Another example is the cost of a car, where insurance and lease payments are fixed but gas and maintenance expenses vary according to the number of miles driven.