The best answer to how technology is being used to protect the natural environment in agriculture is:
b. new agricultural chemicals are being used that cause less environmental damage.
This option reflects advancements in agricultural science, such as the development of more environmentally friendly pesticides and fertilizers that reduce negative impacts on ecosystems while still improving crop yields. Options a, c, and d do not specifically address the protective measures or advancements that technology provides to safeguard the environment in agricultural practices.