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Lucy is trying to load a heavy box into a van and wants to minimize the amount of work she does on the box in the process.

Which method of loading the box will require Lucy to do the least amount of work on the box? All methods start with the box on the ground and end with the box in the van and involve the box being moved with a constant velocity.

A

Lifting the box vertically from the ground to the van.

B

Sliding the box up a short frictionless ramp angled at $30^\circ$ to the ground.

C

Sliding the box up a long frictionless ramp angled at $10^\circ$ to the ground.

D

All three methods require the same amount of work.

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