This sympathetic nervous system is a part of our body's involuntary nervous system, which is formed of harmonized networks of nerves, hormones, and brain structures. This concept of sympathetic nervous system can be understand through an example like , imagine you are crossing a road and truck is coming towards you at a high speed or imagine you are facing down a grizzly bear at that time our bodies generates a physical stress response which prepares us to either take a stand(fight) or run away from the situation, and these responses are activated because of the sympathetic nervous system.
Pretty confident that it is A, judging by that the word composition is used as a combination or a ratio of 2 things. Also none of the other options make sense.
