The heat of neutralisation of $$CH_3COOH$$, $$HCOOH$$, $$HCN$$ and $$H_2S$$ are $$-55.2$$, $$-56.07$$, $$-2.8$$ and $$-3.34$$ kJ per equivalent respectively. The increasing order of strength of these acids is

A

$$HCOOH < CH_3COOH < H_2S < HCN$$

B

$$H_2S < HCN < HCOOH < CH_3COOH$$

C

$$HCN < H_2S < CH_3COOH < HCOOH$$

D

$$CH_3COOH < HCOOH < HCN < H_2S$$