Final answer:
The incorrect statement about the Classical Theory of concepts and categorization is 'D. Almost no necessary and sufficient features exist.' The Classical Theory contends that there are definitive features that establish categories, contrary to the fluid nature of real-world concept categorization.
Step-by-step explanation:
When discussing the Classical Theory of concepts and categorization, it is posited that concepts act like definitions found in a dictionary, and they comprise a list of necessary and sufficient features for accurate categorization. However, the statement that is NOT true when describing the Classical Theory of concepts and categorization is 'D. Almost no necessary and sufficient features exist.' The Classical Theory actually asserts that there are clear-cut necessary and sufficient features that define categories. It does not take into account the fluidity and exceptions that often occur in real-life categorization, such as the complexity of concepts like 'justice' or 'the good.'
Furthermore, the statement 'C. Some concepts are easier to learn than others' aligns with the understanding that while some concepts may be straightforward and readily learned through direct experience, others may be abstract and require more complex learning processes. The Classical Theory also doesn't fully account for natural concepts that are understood through experiences rather than rigid definitions.