In the poultry industry,the production of hatching eggs is more expensive than the production of market eggs mainly because:

• A
  The cost of males and their depreciation value is high.
• B
  Mortality among females is usually lower when they are mated with males.
• C
  The number of eggs produced by the hatchery flock is to be sold only as market eggs.
• D
  Some of the eggs produced by hatchery flocks are not acceptable for incubation.