Question

forces acting on an object are unbalanced, which factor may result from an unbalanced force?

The net force is negative.
There is zero net force.
The forces cancel each other out.
There is no change in motion.

Answer 1

"The net force is negative."

Explanation: Unbalanced forces mean the net force is not zero, so the object will accelerate (its motion changes). Depending on your chosen sign convention the net force could be positive or negative; of the given choices only "the net force is negative" represents a nonzero net force.