In a certain region of space,the gravitational field is given by $E = -k/r$,where $r$ is the distance and $k$ is a constant. If the gravitational potential at $r = r_0$ is $V_0$,then what is the expression for the gravitational potential $V$?
- A$k \log(r/r_0)$
- B$k \log(r_0/r)$
- C$V_0 + k \log(r/r_0)$
- D$V_0 + k \log(r_0/r)$
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