Which of the Following Statements Regarding a Linear Cost Function

Which of the following statements regarding a linear cost function is TRUE?

A) When there are only fixed costs, total material costs increase as the number of units produced increases.
B) The slope coefficient of a mixed cost line intersects the vertical axis at zero.
C) The relationship between the cost driver and the fixed cost is represented by the cost-benefit relationship.
D) It is easier to identify a single measure of benefit in a more heterogeneous cost pool.
E) A linear cost function for manufacturing overhead can be graphed when their is a cause-and-effect relationship between the level of activity and the costs related to that level of activity.