C Limited Manufactures Specialist Medical Equipment

C Limited manufactures specialist medical equipment.Recruitment and training of manufacturing staff is difficult and C's operations management estimates that only 160 000 hours of labour at a rate of $50 per hour will be available in the next financial year.The following details relate to C's planned production of three products X,Y and Z for the next 12 months.To maximise profits the products C should manufacture are:

A) Y then Z
B) Y then Z,then X.
C) X then Z.
D) X then F,then Y.