Answer:
A) cerebellum
Explanation:
The cerebellum is a part of the brain located at the back of the skull in all vertebrates. It regulates and coordinated the muscular activity. It is also known as the 'small brain'. The cerebellum controls the body balance and coordination. It also maintains equilibrium and posture.
Thus in the context, Yves cerebellum is not function properly for which he is loosing his balance and is not able to walk in a straight line.
Hence the correct option is (A).
