If You Are Standing in the Middle of a River

Multiple Choice

If you are standing in the middle of a river and look at either side, you might see tall earthen hills. What are they and what do they do?

A) They are levees and they hold in floodwaters.
B) They are drains and they drain water to the city.
C) They are dams and let water out slowly.
D) They are cutbanks and they hold in water.