Which of the Following Is an Example of a Deficit

Which of the following is an example of a deficit on a frontal lobe task experienced by people with paranoid schizophrenia?

A) slower response time to press the keys in the Continuous Performance Task
B) sorting cards according to previous sorting rules on the Wisconsin Card Sorting Task
C) responding slowly when the sorting rule is changed to 'shape' in the WCST
D) responding slowly when the sorting rule is changed to 'colour' in the WCST
E) inability to determine whether the symbol presented meets the necessary criterion in the CPT