Amonopolistically competitive firm chooses
a. the price of the product it sells but market forces determine the quantity it will be able to sell.
b. the price of the product it sells but the quantity of output to produce is agreed upon by all firms in the industry.
c. the quantity of output to produce but the price of the product it sells is determined collectively by all firms in the industry.
d. both the quantity of output to produce and the price at which it will sell its output.

D. both the quantity of output to produce and the price at which it will sell its output.

Explanation:

A monpolistically competitive firm chooses the price and the quantity to produce. This decision is guided by market conditions and the goal to maximise profit.

A monopolistic competitive firm has a downward sloping demand curve just like a monopoly, so the monpolistically competitive firm chooses the quantity that maximises its profit and then chooses price.

A downward sloping demand curve indicates that quantity demanded is sensitive to price. The higher the price, the lower the quantity demanded.

A monpolistically competitive firm is a firm that has features of both a monopoly and a competitive firm.

The ability of a monpolistically competitive firm to set prices makes it a price maker.

Just like a monopoly, a monopolistically competitive firm has the following features:

1. It faces of downward sloping demand curve.

2. It sets the price for its products.

Just like a perfect competition, a monopolistically competitive firm has the following features:

1. No barriers to entry or exit.

2. There are many buyers and sellers

Other features of a monpolistically competitive firm are:

1. Firms sell differentiated products

2. Firms engage in non price competition.

i think the answer to your question is b. directive

answer(d) all of the choices are correct;