Rosalind Franklin was the one who pioneered the structure of DNA through his X-ray diffraction images at King's College. His failure to explain the double helix structure was the reason why Watson and Crick were the person who were accounted by the discovery. The huge model by Cirick and Watson proved the theory of Franklin who failed to give an evidence.
The right option is; They allow the body to react to stimuli.
Nerve cells, (also called neurons) are specialized cells that are found in their millions in the nervous system. Nerve cells are created to stimulate other cells in the body. They transmit messages in the form of electrical signals within the body, and they allow the body to respond to stimuli. Neurons are grouped into three types which are; sensory neurons, motor neurons and association neurons.