The principle illustrated when most people are able to recognize a variety of examples of chairs even though no one category member may have all of the characteristic properties of "chairs" (e. g., most chairs have four legs but not all do) is .

Is the principle of family resemblance.

Explanation:

The family resemblance concept is a philosophical idea where despite the fact that some objects that supposedly belong to the same category (e.g. chairs) can look very different from each other in shape and appearance, would still be classified under the same category.

it would be d). more resources must be obtained to attain that combination of goods and services