To determine which object would reach 100 feet in the least amount of time, we would need additional information about the objects, such as their mass, shape, air resistance, and the forces acting on them during descent or ascent.
If we assume we are in a vacuum (no air resistance) and the objects are in free fall under the influence of gravity, they would all reach 100 feet at the same time regardless of their mass or shape, because all objects fall at the same rate due to gravity.
However, if air resistance plays a role, the object's shape and mass would matter, and we would need specific details about each object to make a determination.
Based on the information given, it's unclear which object would be the fastest without further details. Therefore, the most appropriate answer from the provided options is:
They would all reach 100 feet at the same time.