Respuesta :
The peripheral nervous system—which is a network of nerves extending from your brain and spinal cord to all parts of your body—carries signals back and forth, is the properly punctuated revision. Thus, option D is correct.
What is punctuation?
Punctuation is the grammatical tools, symbols, and marks used for the correct structure and meaning of the sentence. In the given sentence hyphen (-) mark is used to join and interlink the two separate sentences.
Thus, a hyphen mark is inserted between the system—which, and body—carries.
Learn more about hyphens here:
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