The correct answer is 3
Work is defined mathematically as
The cosine term acts to project the force vector into the direction of the displacement.
For example, if
In general, we consider only the component of F that acts in the direction of
Choice 1 is too restricted and does not correctly allow for two-dimensional motion.
Choice 2 is completely wrong!
Choice 4 - what!?
Choice 5 - the object must move, or no work is done.
Choice 6 - Each force can do work on the object. The net force will determine the change in kinetic energy that results.