The Justification for Industry Regulation Based on the Argument That

The justification for industry regulation based on the argument that it is most efficient to have only one seller in a market makes sense when that seller:

A) is the largest of all the competing sellers in its market.
B) produces a good in which the public has a limited interest.
C) faces decreasing long-run average total costs as its level of output becomes larger.
D) uses small, inexpensive, non-specialized machinery and equipment to produce its product.