Perfect competition is the correct answer because in a fruit market, there are typically many buyers and sellers, with no single seller having control over the market. In perfect competition, there is free entry and exit for businesses, homogeneous products, perfect information, and no market power for any individual seller. This means that each seller has to accept the prevailing market price and cannot influence it. In a fruit market, where there are many small-scale farmers and vendors, perfect competition is the most suitable market structure.