Capital resources include
a. all of the contributions of humans, be they physical or mental.
b. only things like soil, forests, water, and minerals.
c. all of the tools and machines used in industry.
d. anything that is naturally made by earth.

Capital resources include all of the tools and machines used in industry.

Explanation:

Capital resources are the man-made tools, machines used in the production of goods. Capital resources can be an asset, tool, piece of machinery that is handled by concern over an extended period.Capital resources are goods manufactured and used to produce other goods and services.

Goods can usually be categorized as both consumer goods or capital goods. For case, when a person buys a car for personal use, the car is a consumer good. When a company buys a car to transport products, the car is considered a capital good.