Pace's Total Cost of Producing CO₂ Cartridges Is Given by TC

Multiple Choice

Pace's total cost of producing CO₂ cartridges is given by TC = 0.5X ³ - 24X ² + 144X.The level of output that minimizes average total cost is:

A) 12 cartridges.
B) 10 cartridges.
C) 18 cartridges.
D) 20 cartridges.
E) 24 cartridges.