Question

if the upward force is greater than the downward force, what will happen?
box stays at rest
box does not move
box accelerates upward
box accelerates downward

Explanation:

According to Newton's second - law of motion ($F = ma$, where $F$ is the net force, $m$ is the mass, and $a$ is the acceleration), when the upward force is greater than the downward force, the net force is upward. Since mass is positive, there will be an upward acceleration.

Answer:

Box accelerates upward