-In Figure 4

-In Figure 4.2, the reason that the increase in output from point B to C is much greater than the increase in output from point C to D is that

A) it always costs more money to increase output.
B) small levels of production are often inefficient and that significant increases in production can occur thereafter at only a small additional cost.
C) it is very difficult and very expensive to increase output once the capacity of the machinery has been reached.
D) there is waste.