Not all of the members of everyday categories have the same features. most fish have gills, fins, and scales. sharks lack the feature of scales, yet they are still categorized as fish. this poses a problem for the approach to categorization.
a) prototype
b) exemplar
c) classical (definitional)

c) classical (definitional)

Explanation:

Based on the information provided within the question it can be said that this poses a problem for the approach to categorization known as the classical or definitional approach. This approach follows the idea of categorizing things based on resemblance in many aspects of the items in the category, or items that follow a specific definition. Which in this scenario if the fishes that don't match in the same characteristics as the other fishes are placed in the same category then it will cause confusion and problems.

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