Which of the following must be true in order for an object to stay in place?
the forces must be balanced.
the forces must be positive.
the forces must be negative.
the forces must be gravitational.

The forces must be balanced.

This is in accordance to Newton's first law of motion, which states that an object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force.
An unbalanced force is also known as a resultant force.

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