Entry barriers:

A) exist in all market structures.
B) exist in perfect competition and monopolistically competitive markets.
C) do not exist in any market structures;otherwise nothing would be produced.
D) exist in monopoly and oligopoly markets.

Entry Barriers

Factors that prevent or hinder the ability of a new firm to enter and compete in an industry.

Market Structures

The organizational and other characteristics of a market, including the number and size of firms, extent of competition, and type of product differentiation, impacting the behaviour and profitability of businesses within the market.