If the head of cockroach is removed, it may live for few days because

1. A. the cockroach does not have nervous system.
2. B. the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
3. C. the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
4. D. the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.

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