If a Firm Produces in a Perfectly Competitive Output Market

If a firm produces in a perfectly competitive output market,

A) then it demands its resources in perfectly competitive input markets
B) then it demands labor in a perfectly competitive labor market
C) the type of market in which it demands labor may be perfectly competitive or imperfectly competitive
D) the labor demand curve is the same as its product demand curve
E) the labor demand curve facing the firm is perfectly elastic