Identify the correct expression that may be used to determine the submerged unit weight ($$\gamma'$$) of soil. (V = Total volume of soil sample; $$V_s$$ = Volume of solids; $$\gamma_w$$ = Unit weight of water; $$\gamma_d$$ = Dry unit weight of soil; G = Specific gravity of soil grains)

A

$$\gamma' = \frac{V_s \gamma_w(G - 1)}{V}$$

B

$$\gamma' = \frac{V_s \gamma_d(G - 1)}{V}$$

C

$$\gamma' = \frac{V_s \gamma_w}{V(G - 1)}$$

D

$$\gamma' = \frac{V_s \gamma_d}{V(G - 1)}$$