The most likely explanation for the results is:
Naveed’s object had greater kinetic energy.
This is because Naveed's object penetrated the sand deeper (4.0 cm) compared to Maddie's object (1.8 cm). The greater depth suggests that Naveed's object may have had a greater mass or received more kinetic energy upon impact, leading to a larger hole in the sand. However, since the question hints to choose an explanation from the given options, the choice about kinetic energy accurately reflects the relationship between the energy of the falling objects and the resulting impact.