To determine which object would reach 100 feet in the least amount of time, we would typically need information about their initial velocities, accelerations, and the forces acting on them. Without that information, it's difficult to know which object would reach the height first.
If these objects are falling freely under the influence of gravity (ignoring air resistance), they would all reach 100 feet at the same time, since they would all accelerate at the same rate (9.81 m/s² or approximately 32.2 ft/s²), regardless of their masses.
However, if there are differences in their initial velocities or if they are projectiles with different angles or speeds, then further analysis would be needed.
Given the options you've provided, if the objects are in free fall, then:
They would all reach 100 feet at the same time.