Identify X in the given pie chart of composition of air and select the option that correctly fills the following blank.
X component of atmospheric air helps in _______.
(i) Maintaining water cycle of the environment
(ii) Respiration
(iii) Photosynthesis
(iv) Extinguishing fire
(v) Formation of fog
(vi) Burning of candles
A(ii) and (vi) only
B(i), (ii) and (iii) only
C(i), (iii), (iv) and (v) only
D(ii), (iv) and (vi) only