b) Medulla oblongata consists of reflex centres that control heartbeat, blood vessel diameter and rhythm of breathing as well as other vital functions.
c) The two cerebral hemispheres are divided into four lobes which are the centres of motor, sensory and association activities.
d) Cerebellum serves to coordinate the voluntary movements of skeletal muscles as well as posture, balance and equilibrium.
So, the correct answer is option A.