Hi!
The correct option would be B. Brain.
The diencephalon is the major part of the forebrain. It is located between the telencephalon and the midbrain. The structures that compose it include: thalamus, the epithalamus, the subthalamus and the hypothalamus. The diencephalon is an essential vessel formed during embryogenesis , dervived from prosencephalon.
Hope this helps!
<span>Eating foods with sufficient amounts Vitamin A of will help keep your eyes working correctly.</span>