Which chemicals are likely to be used on livestock?

The appropriate choice reflects the fact that all the listed chemicals—pesticides, antibiotics, and hormones—are indeed utilized in livestock management for various purposes.

Pesticides are applied to livestock primarily to manage parasites and pests that can harm the animals, affecting their health and productivity. This application ensures that livestock remain healthy and can produce high-quality products, such as meat and milk.

Antibiotics are employed in livestock to treat or prevent bacterial infections, promoting animal welfare and productivity. Their use helps to ensure that livestock can thrive in their environments, ultimately leading to healthier animals and safer food products.

Hormones may be used in livestock to enhance growth rates, improve feed efficiency, or regulate reproductive cycles. Using hormones can lead to increased productivity within the livestock industry, which is essential for meeting food demand.

Since each of these chemicals serves a specific purpose in livestock management, the most comprehensive and accurate choice is that all of the above are likely used in this context.