In a certain region of space,the gravitational field is given by $E = -\frac{K}{r}$,where $r$ is the distance from a fixed point and $K$ is a constant. Taking the reference point to be at $r = r_0$ with potential $V = V_0$,the potential at a distance $r$ is:

• A
  $V = -V_0 + K \ln \left( \frac{r}{r_0} \right)$
• B
  $V = V_0 + K \ln \left( \frac{r}{r_0} \right)$
• C
  $V = V_0 + K \ln \left( \frac{r_0}{r} \right)$
• D
  None of these