To find:
The reason for the regular interval of 12 hours between the tides.
Step-by-step explanation:
The earth rotates in the same direction as the revolution of the moon around the earth. Thus, it takes the earth an extra fifty minutes every day to catch up to the moon. That is the earth catches up to the moon every 24 hours and 50 minutes.
Thus there will be two high and two low tides in a day. Thus there will be 12 hours of interval between two high tides. In other words, the side of the earth that is far from the moon will be near the moon after 12 hours.
Final answer:
Thus the correct answer is option B.