Correct answer only !

which example has gravitational potential energy?

GPE = mgh

So we are looking for an answer with a height involved with it:

A bicycle moving horizontally has no height above earth's surface (assuming earth's surface is our 0 reference point), so therefore it has no GPE. It would have KE however.

A horse slowing down from a run: no mention of height so therefore no GPE, KE however is present

A beaker sitting on the floor has no KE or GPE.

So an apple about to fall from a tree branch is the best example of GPE because a tree branch usually has a height to it meaning that GPE is present.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.