Oliver takes two identical marbles and drops the first one from a certain height. A short time later, he drops the second one from the same height. How does the distance between the marbles change while they are falling to the ground? Choose the best answer and explanation.

The distance stays the same because both marbles are falling with the same acceleration.

The distance increases because the first marble moves faster than the second marble at every instant of time.

The distance stays the same because the velocities of the marbles are equal at every instant of time.

The distance increases because the first marble moves with greater acceleration than the second marble.