Why does a steeper approach cause an increased landing rollout? A pilot of a high-performance airplane should be aware that flying a steeper-than-normal VASI glide slope angle may result in:

A) a hard landing

B) increased landing rollout

C) landing short of the runway threshold

This is an ATP question and the answer is B. Could anybody explain why the answer is B, not A?
I'll just formalize my comment here as an answer:

Landing is all about managing the aircraft's energy. When you are coming in for a landing with a steep approach it usually means that you will have more energy (speed) as you approach the ground. A high ground speed as you approach the runway usually means floating and/or, just like in a car, a longer distance to slow down. That extended distance you would need to bring the plane to a stop or slow enough to taxi off the runway would be the extended roll-out. Therefore B is the best answer.

A is incorrect because a steep approach does not necessarily mean a hard landing. The smoothness of a landing is dependent on the pilot knowing the appropriate moment to flare.

C is incorrect because unless the pilot is trying to land short of the threshold a steep approach can be done anywhere over any part of the runway/approach.