Manico Corporation Produces Three Products -- X,Y,& Z -- with the Following

Manico Corporation produces three products -- X,Y,& Z -- with the following characteristics:
The company has only 2,000 machine-hours available each month.If demand exceeds the company's capacity,in what sequence should orders be filled if the company wants to maximize its total contribution margin?

A) orders for Z first,X second,and Y third
B) orders for X first,Z second,and Y third
C) orders for Y first,X second,and Z third
D) orders for Z first and no orders for X or Y