The Fundamental Difference Between a Perfectly Competitive and Monopolistic Profit

Multiple Choice

The fundamental difference between a perfectly competitive and monopolistic profit maximization problem is that, in a competitive market MR:

A) diminishes as quantity increases while in a monopoly it is fixed.
B) is fixed while in a monopoly it diminishes as quantity increases.
C) increases as quantity increases while in a monopoly it is fixed.
D) diminishes as quantity increases while in a monopoly it increases.