All Terrain Tires Manufactures Three Different Off-Road ATV Tires: Model

All Terrain Tires manufactures three different off-road ATV tires: Model A, Model B, and Model C. Plenty of market demand exists for all models. The table below reports the prices and costs per unit of each product:
Assuming that machine hours are limited (i.e., this is the constrained resource) , which model is the most profitable to produce?

A) Model A
B) Model B
C) Model C
D) Model A and B would be equally profitable
E) Model B and C would be equally profitable