Which of the Following Statements Regarding Fixed Costs Is Incorrect

Which of the following statements regarding fixed costs is incorrect?

A) Expressing fixed costs on a per unit basis usually is the best approach for decision-making.
B) Fixed costs expressed on a per unit basis will react inversely with changes in activity.
C) Assumptions by accountants regarding the behaviour of fixed costs rest heavily on the concept of the relevant range.
D) Fixed costs frequently represent long-term investments in property,plant,and equipment.