Molality ($$m$$) of $$3M$$ aqueous solution of NaCl is : (Given : Density of solution $$= 1.25 \text{ g mL}^{-1}$$, Molar mass in $$\text{gmol}^{-1}$$: Na $$- 23$$, Cl $$- 35.5$$)

A

$$1.9 \text{ m}$$

B

$$3.85 \text{ m}$$

C

$$2.79 \text{ m}$$

D

$$2.90 \text{ m}$$