In which of the following situations is the most work done on the object?

AHolding a 50 kg object.

BCarrying a 30 kg object down a 40 m long hallway.

CLifting a 20 kg object 1 m up.

DCarrying a 15 kg object up a flight of stairs.

ELowering a 25 kg object from a second story balcony to the ground