Which of the Following Best Describes the Behaviour of Variable

Multiple Choice

Which of the following best describes the behaviour of variable cost per unit?

A) Variable cost per unit varies in direct proportion with the activity level.
B) Variable cost per unit varies in decreasing proportion with the changes in the activity level.
C) Variable cost per unit varies in increasing proportion with changes in the activity level.
D) Variable cost per unit remains constant with changes in the activity level.