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I would say the third one, for every action, there is an equal and opposite re-action.
Newton's third law of motion is used to predict that the forces in parts a and b are equal and opposite
What is Newton's third law of motion?
Newton's third law of motion state that for every action force there exists a complementary reaction force that balances it. In other words, one can say that the action and reaction force pair exist in the pair with an equal magnitude but are opposite in the direction.
There are several applicative examples in our day-to-day life that explain Newton's third law of motion for example a man walking on earth is a very good demonstration of the third law of motion.
Thus we can say that Newton's third law of motion is used to predict that the forces in parts a and b are equal and opposite.
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