A cement concrete road is 1000 m long, 8 m wide and 15 cm thick over the sub-base of 10 cm thick gravel. The cubic content of concrete (1:2:4) for the road specified in is _____

A

$$ 300 m^{3} $$

B

$$ 600 m^{3} $$

C

$$ 900 m^{3} $$

D

$$ 1200 m^{3} $$