The correct option is
A P
The part labelled as P is the forebrain which is mainly involved in the interpretation of information and cognitive skills.
The part labelled as R is the cerebellum which helps to maintain the coordination and posture of the body.
The part labelled as Q is pons which is aprt of hindbrain and it helps to transfer the message between cortex and cerebellum.
The part labelled as S is spinal chord which helps to transmit signals from the brain to the other parts of the body.
So, the correct answer is option A.