A Crate Travels Through a Factory on a Conveyor Belt

Multiple Choice

A crate travels through a factory on a conveyor belt (without slipping) at a constant speed. The conveyer belt is inclined at some non-zero angle above the horizontal. If air resistance is negligible, what forces are active on the box?

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