Which organism has a nerve net that allows it to respond to a stimulus in a coordinated way

Nerve Net is considered as the simplest type of nervous system. This does not have a distinct central or peripheral regions, and lack anything that resembles a brain. The nerve cells are scattered in each layer of the body wall and these neurons send information from sensory organs. Based on the given choices above, the organism that has a nerve net that allows it to respond to a stimulus in a coordinated way is the HYDRA. The answer would be option C.