Force acting on a particle moving in a straight line varies with the velocity of the particle as $F = \frac{K}{v}$. Here $K$ is a constant. The work done by this force in time $t$ is
- A$\frac{K}{v^2} \cdot t$
- B$2Kt$
- C$Kt$
- D$\frac{2Kt}{v^2}$
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