Reproduction in the average total cost of producing a products as the firm expands the size of plants (its output) in the long run________________?

Reproduction in the average total cost of producing a products as the

1.	Reproduction in the average total cost of producing a products as the firm expands the size of plants (its output) in the long run________________?
A.	Economics of scale
B.	Economics of mass production
C.	Both of these
D.	None of these
Answer» D. None of these