In Summarizing the Research on Frontal Lobe Deficiency, One Could

In summarizing the research on frontal lobe deficiency, one could interpret the research of Lara Davidson (2003) as suggesting that

A) frontal brain impairment probably affects some patients with schizophrenia, but the impairment is not a necessary part of the syndrome.
B) frontal brain impairment probably affects very few patients with schizophrenia, and is not a necessary part of the syndrome.
C) frontal brain impairment probably affects all patients with schizophrenia, and is a necessary part of the syndrome.
D) an abnormally working frontal brain does not appear to be related at all to the symptoms presented by patients with schizophrenia.
E) only the positive symptoms of the illness reflect an abnormally working frontal brain.