A monobasic acid of weight 15.5 g is heated with excess of oxygen & evolved gases when passed through KOH solution increased its weight by 22 g and when passed through anhydrous CaCl2, increased its weight by 13.5 g. When the same mass of this organic acid is reacted with excess of silver nitrate solution form 41.75 g silver salt of the acid which on ignition gave the residue of weight 27 g. The molecular formula of the organic acid is
(a) C2H6
(b) C2H5O2
(c) C2H6O2
(d) C2H4O