Answer:
A. price taker, because it must accept the market equilibrium price.
Step-by-step explanation:
A perfectly competitive firm is an ideal firm in which different firms sell products that are homogeneous or similar in nature. They are price takers because the prices of goods are determined by changes in demand and supply, therefore they must accept the market equilibrium price. They do not attempt to fix the prices of commodities. The opposite of this type of firm is a monopoly where a firm has complete control of a market, having the ability to change prices as it wills.
An example can be found among businesses that sell similar kinds of products. It could be in the form of grocery stores that sell similar wares. When any of the sellers leave the market, it does not affect the other sellers as their prices are at equilibrium. Therefore, anyone can enter or exit this type of market.