Expense a Is a Fixed Cost; Expense B Is a Variable

Multiple Choice

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,you would expect which of the following statements to be true?

A) Expense A has remained unchanged.
B) Expense B has decreased.
C) Expense A has decreased.
D) Expense B has increased.