Law is based on the fact (here, gravitational pull) and shows the relation between the moon and the earth (tides). Thus, option B is correct.
Tides are the waves observed in seas. It is mainly due to the gravitational pull exerted by the moon on the earth. The tidal force so generated is responsible for high tide and low tide.
Tides, high or low can be predicted timely. Usually there are two high tides and two low tides observed in a day. However, during the full moon and new moon, the earth, moon and the sun align in orientation, creating a combined gravity.
This is responsible for 'spring tides' which can be considered even more higher or lower in amplitude.
Thus, tides are the natural phenomena based on the law of gravity.
Learn more about tides, here:
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