Springer Products Manufactures Three Different Product Lines, Model X, Model

Springer Products manufactures three different product lines, Model X, Model Y, and Model Z. Considerable market demand exists for all models. The following per unit data apply:

If there is excess capacity, which model is the most profitable to produce?

A) Model X
B) Model Y
C) Model Z
D) Both Model X and Model Y have same and highest profitability