Resources are not they become. Critically examine

Many resources are so produce by the combination of other resources.

Explanation:

Resource can be any entity which can be used to fulfill daily requirement of the mankind. It can be living or non-living. Living resources are plants and their products, animals, birds, microbes, and humans. Non-living resource include minerals, soil, rocks, water, and others. A single resource for human use can be composed of many natural or man-made resources. For example a wooden chair is prepared by wood resource derived from trees, iron nails may be used to combine wooden logs to make up a chair and a gum resource from plant is also applicable so a chair is not a single resource in itself but it is a combination of two or more resources.

the answer is the last option or letter d)