"Economies of Scale" Means That

"Economies of scale" means that:

A) as a company produces larger numbers of a particular product, the cost of each unit of the product goes down.
B) the more producers there are in an economy the greater the need for intermediaries.
C) larger countries enjoy more economic growth than smaller countries.
D) as a company produces larger numbers of a particular product, the total cost of producing these products goes down.
E) All of the above are true.