Use the Following to Answer Questions

Use the following to answer questions :
Scenario II
In pioneering research by Sperry and colleagues,split-brain patients were asked to stare at a dot on a screen centered between their eyes,while words of common objects were projected onto the screen either in their left or right visual fields.Subsequently,patients were asked to reach behind a screen with either their left or right hands and identify the object among other common objects by touch alone.
-(Scenario II) The split-brain surgical procedure is almost always performed to reduce:

A) seizure activity among epileptic patients.
B) brain swelling after traumatic injury.
C) delusions and hallucinations among paranoid schizophrenics.
D) the spread of cancerous brain tumours.