Final answer:
Option B, Accidents, is not included in Aristotle's three kinds of substances. Instead, Aristotle's concept of substance includes matter, form, and their composite, while accidents are attributes that can change without altering a substance's essence.
Step-by-step explanation:
The option that is NOT included in Aristotle's three kinds of substance is B. Accidents. Aristotle's conception of substance can be characterized by matter, form, and the composite of the two, but not accidents. Accidents, in the Aristotelian sense, are qualities or attributes that may change without affecting the substance's essence. In exploring substances, Aristotle differentiates them from accidents—attributes that do not constitute the essence of a substance.
Aristotle's discussion of substance emphasizes the importance of particulars and individual instances in understanding whatness or the essence of things. Substance is a key concept in Aristotle's metaphysics, which he explores as the essence that stands under the changing features of things. Additionally, Aristotle asserts that there are substances that are individual entities, and their identity does not rely on a Platonic form existing in an otherworldly realm of perfect templates, but rather on their own particular form and matter composition.