Please explain for points!

20.		Kawasaki sells motorcycles Ninja ZX-6R and Ninja ZX-14R. The Ninja ZX-6R sells for $10,000, has variable cost (labor and material) of $2,000, and requires 10 hours of use of machinery to produce. The Ninja ZX-14R sells for $12,000, has variable costs (labor and material) of $8,000, and requires 2 hours of use of machinery to produce. Kawasaki has excess capacity of 5,000 hours of use of machinery. Which motorcycle should it produce?
A)	The Ninja ZX-6R because it has a higher contribution margin of $8,000.
B)	The Ninja ZX-14R because it has a higher contribution margin per hour of machinery use of $2,000.
C)	The Ninja ZX-6R because it has a higher contribution margin per hour of machinery use of $4,000.
D)	The Ninja ZX-14R because it has a higher contribution margin of $4,000.