Final answer:
The negative symptom of schizophrenia in the options provided is A. Avolition, which is the lack of motivation to initiate or engage in activities.
Step-by-step explanation:
A negative symptom of schizophrenia involves a decrease or loss of ability to initiate plans, express emotions, or find pleasure in life. The correct answer is A. Avolition, which refers to a decrease in the motivation to initiate and perform self-directed purposeful activities. This is different from disorganized speech, hallucinations, and delusions, which are considered positive symptoms because they represent an excess or distortion of normal functions. Negative symptoms such as avolition can be particularly disabling as they impact the ability to carry out day-to-day tasks.