Disorganized speech and grossly disorganized behavior represent the in schizophrenia. a. a concrete set of defining negative symptoms b. a concrete set of defining positive symptoms c. a wide range of possible positive symptoms d. a wide range of possible negative symptoms

I believe the answer is: C.  a wide range of possible positive symptoms

Symptoms would be considered as a 'wide range' if that symptoms almost always happen even though there is some occurrences when they don't happen.
And the symptoms would be considered as positive if it affect thoughts, behaviors, or sensory perceptions of the patient.