What phase of matter is letter (a)? How do you know?

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There would be a movement in that direction

Explanation:

When one end of a tug of war rope has a large net force than the other, there would be movement in that direction with a greater amount of force.

This is in cognizance of the Newton's first law of motion which states that "a body will continue in its state of rest or uniform motion unless its is acted upon by an external force".

The external force in this regard is the unbalanced force associated with the pull.

When forces are balanced, there would be no movement or a body will maintain uniform motion.

Unbalanced forces leads to motion.