To Answer,refer to the Following: "At Huffy's

Multiple Choice

To answer,refer to the following: "At Huffy's ...bicycle factory,1,700 employees turn out 15,000 bicycles a day in 1987) .Five years before,it required 2,200 workers to make 10,000 bikes daily." The Wall Street Journal) .
Holding all else equal,we can conclude that,over those years,

A) Huffy's average variable cost decreased.
B) Huffy's average variable cost increased.
C) Huffy's marginal cost decreased.
D) Huffy's marginal cost increased.
E) both a and c