In the scenario described, where there is no air resistance, the value that will be different for the two objects is the velocity of the objects when they reach the ground. Although both the hammer and the feather will fall at the same acceleration due to gravity (approximately 9.81 m/s² on Earth), their velocities just before impact will depend on the height from which they are dropped. However, since there is no air resistance, both will fall in the same manner and reach the same velocity. Thus, the correct response is that the upward push of air resistance would be different if there were air (not applicable here) but in a vacuum, they would be equalized in terms of time and velocity, so the answer that fits the context without air resistance is that there will no difference in terms of air resistance affecting them.
To clarify: all objects in free fall in a vacuum fall at the same rate regardless of their mass, hence all responses would ultimately show no difference in time or final velocities if air resistance is truly neglected.