Which of the followig statements are correct in reference to the role of A (shown in the given diagram) during a breathing cycle in human beings ?

(i) It helps to decreases the residual volume of air in lungs.
(ii) If flattens as we inhale.
(iii) It gets raised as we inhale.
(iv) It helps the chest cavity to become larger.

Options

A. (ii) and (iv)
B. (iii) and (iv)
C. (i) and (ii)
D. (i), (ii) and (iv)