curve for a monopoly and a monopolistically competitive firm?

Question

Select one:
a. The MR curve is the same as the demand curve in the long run
b. Because of product differentiation, monopolistically competitive firms have more elastic demand and MR curves
c. Advertising can shift the MR curve
d. Monopolistically competitive firms are price takers because of the many close substitutes

Answer 1

the whole question didn't post, oops.

What is the biggest difference between the marginal revenue curve for a monopoly and a monopolistically competitive firm?

Select one:
a. The MR curve is the same as the demand curve in the long run
b. Because of product differentiation, monopolistically competitive firms have more elastic demand and MR curves
c. Advertising can shift the MR curve
d. Monopolistically competitive firms are price takers because of the many close substitutes