A cubical block of wood l0 cm on a side floats at the interface between oil and water, as in Fig. with its lower face 2 cm below the interface. The intensity of the oil is 0.6 g ${\mathrm{cm}}^{-3}$. The mass of the block is

• A

  340 g

• B

  680 g

• C

  80 g

• D

  10 g