Exhaustible natural resources are those that are limited in quantity and can be depleted by human activities. They take a very long time, often millions of years, to form and cannot be replenished quickly.

Among the options:

Air, water, and sunlight are inexhaustible resources. They are generally available in unlimited quantity and are not depleted by use.

Forests are an exhaustible resource. They can be overused and depleted through deforestation if not managed sustainably.

Final answer: forests