3. Mr.C is a fitness instructor, before performing an extraneous activity he first do a warm-up exercise through proper breathing. He breath in (inhale) and breath out (exhale). Which series of processes takes place in the respiratory system when Mr. C inhale.
l. the diaphragm muscle contracts
II. the diaphragm moves down and expands the thoracic cavity
Ill the ribs move up and increase the scale of cavum
IV. air pushes in from the surface where there's higher gas pressure and pushes into the lungs where there's lower atmospheric pressure

A. I, II, III, IV
B. II, III, I, IV
C. III, II, I, 11
D. I, II, IV, III​