If the head of a cockroach is cut off,it will still be alive for as long as one week. This is because

• A
  the body is covered with a hard chitinous exoskeleton.
• B
  the head holds only a small portion of the nervous system,while the rest is situated along the ventral part of the body.
• C
  the head is of no use to the cockroach.
• D
  the food-capturing apparatus is found elsewhere in the body.