which of the following statements is true about advertising by a monopolistically competitive firm?
a. Advertising will be more beneficial if a monoplistic competitor colludes with other firms to advertise the products of the industry as whole rather than an individual firm's product.
b. monopolisticall competitive firms tend to shum advertising because advertising draws attention to the variety of differentiated products available in the industry.
c. Advertising could make the monopolistic competitor's demand more inelastic, but advertising has no effect on a perfect competitor's demand