Economies of Scale Exist as a Firm Increases Its Size

Economies of scale exist as a firm increases its size in the long run because of all of the following except:

A) The firm can afford more sophisticated technology in production.
B) Labour and management can specialise even further in their tasks.
C) As a larger input buyer, the firm can purchase inputs at a lower per unit cost.
D) As a firm expands its production, its profit margin per unit of output increases.