Q. Arrange the following gases present in atmosphere in the decreasing order of volume :
I. Helium
II. Oxygen
III. Nitrogen
IV. Argon

• (A) (I), (III), (III), (IV)
• (B) (II), (III), (IV), (I)
• (C) (III), (II), (IV), (I)
• (D) (IV), (III), (I), (II)