A Crate Travels Through a Factory on a Straight, Horizontal

Multiple Choice

A crate travels through a factory on a straight, horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?

A) normal force, weight, static friction
B) normal force, weight, force of the conveyor belt
C) normal force, weight, force of the conveyor belt, static friction
D) normal force and weight