Schematic diagram:
The work done by the weight of the box is given as,
Here, m is the mass of the box, g is the acceleration due to gravity, and h is the height.
Note: mg is the weight of the box (mg=30 N; given).
Substituting all known values,
Therefore, the work done by the weight (gravitational force) of the box is about 110 J. Hence, option (2) is the best choice.