What happens when we breathe in? (i) Size of our chest increases. (ii) Size of our chest decreases. (iii) Carbon dioxide is removed from our body (iv) Air enters our lungs.

• A.  (i) and (iii) are correct
• B.  (i) and (iv) are correct
• C.  (ii) and (iii) are correct
• D.  (ii) and (iv) are correct