The largest, most superior portion of the brain: it is divided into two hemispheres:

A. cerebellum

B. cerebrum

C. diencephalon

D. medulla oblongata

The correct answer is B. The largest, most superior portion of the brain, that is divided into two hemispheres is the cerebrum.

Explanation:

The cerebrum forms the largest portion of the brain. Together with the Diencephalon, it constitutes the Prosencephalon during embryonic development. The cerebrum comprises the two right and left cerebral hemispheres, incompletely separated by the longitudinal fissure of the brain.