Suppose a Perfectly Competitive Firm and a Monopolist Are Both

Multiple Choice

Suppose a perfectly competitive firm and a monopolist are both charging $5 for their respective products. From this, one can infer that:

A) the marginal benefit from selling an additional unit of output is $5 for both firms.
B) the marginal benefit from selling an additional unit of output is $5 for the competitive firm and less than $5 for the monopolist.
C) the marginal benefit from selling an additional unit of output is less than $5 for both firms.
D) the competitive firm is charging too much, and the monopolist is charging too little.