The correct option is
C Prosencephalon
The brain is divided into 3 main parts, Hindbrain (rhombencephalon), Midbrain (mesencephalon) and
Forebrain (prosencephalon). Derivatives of prosencephalon are diencephalon and telencephalon (cerebrum). The cerebrum is the largest part of human brain. It consists of two cerebral hemispheres. It controls all involuntary movements.
Thus, the correct answer is option C.