physics

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In which of the following situations is the most work done on the object?
A. Holding a 50 kg object.
B. Carrying a 30 kg object down a 40 m long hallway.
C. Lifting a 20 kg object 1 m up.
D. Carrying a 15 kg object up a flight of stairs.
E. Lowering a 25 kg object from a second story balcony to the ground

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