Answer:
All three have the same change in potential energy.
Step-by-step explanation:
The potential energy is calculated as:
U = mgh
Where m is the mass, g is the gravity and h is the height. Since the mass and gravity are constant, the change in potential energy only depends on the change in height.
Now, we can see that in all 3 paths, the block is dropped from the same position, and all three ends in the ground. So, the change in potential energy will be the same for all the paths
Therefore, the answer is
All three have the same change in potential energy.