When a certain amount of a univalent salt AB of molar mass 54 g $$\text{mol}^{-1}$$ was dissolved in 0.1 $$\text{dm}^3$$ of water, the relative lowering of the vapour pressure was found to be 3.55%. Assuming complete dissociation of the salt under the given condition and taking the density of water as 1 g $$\text{cm}^{-3}$$, the molality of the resulting solution is

A

0.5 m

B

1.0 m

C

2.0 m

D

4.0 m