Concept:Free entry means there are no restrictions preventing firms or individuals from starting to operate in a market.
Explanation:When barriers to entry are absent, new firms can easily join the market.
Existing firms can also leave the market freely if they wish.
This condition describes a perfectly competitive market.
In such a market, buying and selling are open to everyone.
Therefore, no barriers mean that anyone can become a buyer or a seller.
Answer:A. anyone can become a buyer or a seller