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The answer is letter D. The negative symptom of schizophrenia is the lack of motivation. Lack of motivation is also known as avolition which lacks the interest of any activities. Delusion, hallucination and word salad are positive symptoms.

The lack of motivation and moodiness are some of the negative problems of schizophrenia. If the negative symptom are more evident compared to the positive ones, it will be more difficult to treat. It is very important to address the negative problems in order to cure schizophrenia