$A$ spaceship in space sweeps stationary interplanetary dust. As a result,its mass increases at a rate $\frac{dM(t)}{dt} = bv^2(t)$,where $v(t)$ is its instantaneous velocity. The instantaneous acceleration of the spaceship is
- A$-\frac{2bv^3}{M(t)}$
- B$-\frac{bv^3}{2M(t)}$
- C$-bv^3(t)$
- D$-\frac{bv^3}{M(t)}$
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