The of schizophrenia are marked by a distortion or an excess of normal function, whereas the reflect social withdrawal, behavioral deficits, and the loss or decrease of normal functions.

The positive symptoms of schizophrenia are marked by a distortion or an excess of normal function, whereas the negative symptoms reflect social withdrawal, behavioral deficits, and the loss or decrease of normal functions.
Schizophrenia will impair one's memory and making them unable to function like a normal person. This of course, will lead to social withdrawal and could even make them forget the memory of the people that are the closest to the patient

It's most likely choice a, it makes the most sense in my opinion.