A 50-year-old right-handed man with a long history of rheumatic heart disease with mitral stenosis..

A 50-year-old right-handed man with a long history of rheumatic heart disease with mitral stenosis and atrial fibrillation is brought to the emergency department after collapsing to the floor at home. He is unable to speak or walk and has right hemiplegia with a right extensor plantar response. These findings most likely result from embolism to which of the following arteries? (a) Anterior cerebral (B) Anterior communicating (C) Middle cerebral (D) Posterior communicating (e) Superior cerebellar