Which of the Following Is True of a Perfectly Competitive

Which of the following is true of a perfectly competitive industry?

A) In a perfectly competitive industry, the volume of output produced in the industry is determined by the largest individual seller.
B) In a perfectly competitive industry, the volume of output produced in the industry is determined by the largest individual buyer.
C) In a perfectly competitive industry, a firm can determine the quality of its output.
D) In a perfectly competitive industry, a firm can determine the quantity of its output.
E) In a perfectly competitive industry, the quantity of output produced by a firm is determined by the government.