Correct answer: Low tides
High tides and low tides occur because of the moon. The gravitational pool of moon creates a something, which is called as tidal force or energy. This causes earth and its water to bulge out on the sides that are closest to the moon and the sides that are far away from the moon. This bulges of water create high tides.
As the earth rotates, it passes through each of bulges per day, when it is in one of the bulges it experiences high tides and when it does not come in one of the bulges, it experiences low tides.