The planet and its moon gravitationally attract each other. rank the force of attraction between each pair from greatest to least.

The gravitational force between two attracting objects can be solved through the equation,
                               F = Gm₁m₂ / d²
where m₁ and m₂ are there masses, d is the distance, and G is the gravitational constant. These means that the force is directly related to the masses and inversely to the distance. From the given choices, B will have the greatest energy, followed by C and A, respectively. Lastly, the least force will that be of D. 

Gas will most likely  fill the container