Answer:
Circulatory goes to transportation of gases and nutrients, Nervous causes involuntary movement, Muscular allows movement, digestive breaks down food, immune system protects against pathogens, respiratory causes gas exchange.
I am not 100% sure but I think it’s A sorry if I am wrong but a answer is batter then no answer lol have a good day
B. Expiration occurs, when the lungs contract/ recoil, air rushes out which allows you to breathe out