A 72-year-old woman has the abrupt onset of right face and hand weakness, disturbed speech production, and a right homonymous hemianopsia. This is most likely attributable to occlusion of the:

a. Left middle cerebral artery (The left middle cerebral artery supplies the cortex around the sylvian fissure, as well as some of the frontal lobe structures involved in speech)

b. Left anterior cerebral artery

c. Left vertebrobasilar artery

d. Right anterior choroidal arterye. Left posterior inferior cerebellar artery (PICA)