Final answer:
Disorders of thinking include delusions, obsessions, and anxiety, but phobias are a type of anxiety disorder and not primarily disorders of thinking, making 'phobias' the correct answer.
Step-by-step explanation:
Disorders of thinking typically refer to issues that affect a person's cognitive processes, such as perceptions, judgments, and reasoning. Examples of disorders of thinking include delusions (false beliefs held despite evidence to the contrary), obsessions (recurrent, persistent thoughts), and anxiety (which can sometimes be a symptom or a result of an anxiety disorder). However, phobias are specifically related to intense, irrational fears of specific objects or situations and not primarily a disorder of thinking but rather a type of anxiety disorder. Therefore, the correct answer is B. phobias, as it does not belong in the category of disorders of thinking.