An equation for photosynthesis is written below.Select the correct statements regarding X, Y and Z.
I. X is the gas which constitutes 21% of air in the atmosphere.
II. Y represents the pigment present in green leaves of the plant.
III. Z is the gas which turns lime water milky.
IV. X is the gas which extinguishes fire.
A I and II
B II and IV
C I, II and III
D I, II, III and IV