The velocity of a particle is $\nu = \nu_{_0} + gt = ft^2$. If its position is $x=0$ at $t=0$, then its displacement after unit time $(t=1)$ is :

Question

( A ) $\nu_{_0} + g + f$
( B ) $\nu_{_0} + g/2 + f/3$
( C ) $\nu_{_0} + 2g + 3f$
( D ) $\nu_{_0} + g/2 + f$