What is the name of a market facility where animals are sold to the highest bidder?

The correct answer is "auction" because an auction is a specific type of market facility where items—such as animals—are sold to the highest bidder. In this system, potential buyers participate in the bidding process, which typically involves raising their bids until no one is willing to offer a higher amount. This competitive nature of bidding is central to an auction, making it the most efficient method for determining the price of the item based on what buyers are willing to pay.

In contrast to the correct answer, a market square generally refers to an open public space where various types of sales and trade activities take place, but it does not specifically denote the formal bidding process inherent in auctions. An exhibition hall is typically used for showcasing products or demonstrations rather than selling them through bidding. A trade show usually involves businesses showcasing their products or services to potential buyers and is more focused on promotion rather than the direct sale through bidding. Thus, these options do not accurately describe the specific process and format of selling animals to the highest bidder as an auction does.