The correct answer is C. Forebrain.
The forebrain is the largest and most complex part of the brain. It is responsible for higher functions such as thinking, planning, and decision-making. It also contains the cerebrum, which is the largest part of the brain and is responsible for processing information from the senses and controlling voluntary movement.
The midbrain is a small region of the brain that is located between the hindbrain and the forebrain. It is responsible for controlling movement, vision, and hearing.
The hypothalamus is a small region of the brain that is located below the thalamus. It is responsible for controlling many important bodily functions, such as body temperature, blood pressure, and hunger.
The hindbrain is the oldest and most primitive part of the brain. It is responsible for controlling basic functions such as breathing, heart rate, and digestion.
Here is a diagram of the human brain, with the forebrain highlighted in blue: