GPE = mgh
where:
* m is the mass (30 kg)
* g is the acceleration due to gravity
* h is the height (1 m)
The lower the acceleration due to gravity (g), the lower the GPE.
Therefore, the bowling ball would have the least gravitational potential energy on the body with the lowest gravitational acceleration.
Among celestial bodies, the Moon has the lowest gravitational acceleration.
So, the answer is the Moon.
