Question

what is one of the primary reasons pesticides are used?
to control pests in agriculture and other areas
to promote biodiversity in rural areas
to enhance soil fertility in urban environments
to improve air quality in agricultural land

Explanation:

Pesticides are substances used to kill or control pests (like insects, weeds, fungi). The first option states their use is to control pests in agriculture/other areas, which matches their purpose. Promoting biodiversity (second option) is incorrect as pesticides often harm non - target species. Enhancing soil fertility (third option) is not a function of pesticides (fertilizers do that). Improving air quality (fourth option) is also not a pesticide's role.

Answer:

A. to control pests in agriculture and other areas