Answer:
correct option is C. decreases at a decreasing rate.
Step-by-step explanation:
solution
when an organization gain productivity than its marginal cost will be decreases at a decreasing rate
as here when initial specialization of employee is lead to an significant reduction in the marginal costs though the more specialized people get
and less additional amount is save due to the specialization
so here correct option is C. decreases at a decreasing rate.