Answer:
His absence of appropriate behavior is known as C. negative symptoms.
Explanation:
Schizophrenia has an impact over the way people feel, think, and act. Some symptoms are called positive because they begin to happen due to schizophrenia. The ones that are called negative refer to a lack or normal mental functioning. Among the negative symptoms, we have apathy, withdrawal, loss of motivation, poverty of speech and thought, flattening, etc. As we can see, Victor's lack of expression and will to do things are included in the negative symptoms.