If the gravitational intensity at a height of $8000 \, km$ from the center of the Earth is $6 \, N/kg$,what is the gravitational potential at that point?
- A$8 \times 10^6 \, J/kg$
- B$2.4 \times 10^3 \, J/kg$
- C$4.8 \times 10^7 \, J/kg$
- D$6.4 \times 10^{14} \, J/kg$
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