Which part of human brain is largest?

The correct option is B Cerebrum

• The cerebrum, which develops from the front portion of the forebrain, is the largest part of the mature brain.
  
• It consists of two large masses, called cerebral hemispheres, which are connected by a deep bridge of nerve fibers called the corpus callosum and are separated by a layer, called the falx cerebri.
  Hence, option C is correct.