The correct options are
B High tides help in navigation.
C The tides also bring in a lot more fish closer to the shores.
D Tides can be harnessed to generate energy.
Tides are useful, especially to the people belonging to the coastal communities and such related areas. High tides help in navigation. Tides also bring in a lot more fish closer to the shores, making it easier for the fishermen. Tides can also be harnessed to generate energy.