A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. $H_2SO_4$. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP wil be

Question

( A ) 4.4
( B ) 2.8
( C ) 3
( D ) 1.4