After Patient W

After patient W.J. had his corpus collosum severed, he participated in a series of tasks. One of these tasks demonstrated that the specializations of each hemisphere were different. This task permitted him to use ___________, and onsequently ______________________.

A) his left hand; he was able to press a button when a light flashed on the right side of the screen
B) his right hand; he could not arrange colored blocks to match a simple pattern
C) both hands; he was able to press a button when a light flashed on either side of the screen
D) both hands; his two hands were working in opposition while he arranged colored blocks