As the level of activity decreases:

Group of answer choices

a) total variable costs increase and fixed costs per unit remain constant

b) fixed costs per unit decrease and total variable costs decrease

c) total variable costs decrease and fixed costs per unit increase

d) fixed costs per unit increase and total variable costs remain constant

e) total variable costs increase and fixed costs per unit increase

f) fixed costs per unit remain constant and total variable costs remain constant

g) none of the above choices are correct