Variable and Fixed Costs in the relevant rage?

SS85

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Expense A is a fixed cost; expense B is a variable cost. During the current year the activity level has increased, but is still within the relevant range. In terms of cost per unit of activity, we would expect that:

a. expense A has remained unchanged.
b. expense B has decreased.
c. expense A has decreased.
d. expense B has increased.

I answered A, but I found that the correct answer is C. Why is this so?
 
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