A person runs up two flights of stairs instead of walking up. The person feels more tired because ___?
[A] He does more work when he runs in comparison to when he walks
[B] His power output is greater when he runs in comparison to when he walks
[C] His gravitational force is greater when he runs in comparison to when he walks
[D] He has more inertia when he runs in comparison to when he walks
[toggles][toggle title=”Answer”]

[B] His power output is greater when he runs in comparison to when he walks

[/toggle][/toggles]