The correct options are
A Intercellular communication
B Coordination of diverse activities
C Maintaining homeostasis
Nervous system is a complex system that receives stimulus, processes the information and conveys information so as to perform the action. It carries out intercellular communication as the information is relayed through the cells. It utilises chemical and electrical signals. It coordinates different activities such as listening to the sound, seeing the visuals infront of you, smelling the surroundings, tasting the food that you eat and many more. It has different components which try to strike a balance in the body by performing opposing functions such as flight or fight actions and calming actions are all instructed by the brain.
Oxygen is carried by the blood and not by the parts of the nervous system.