Dams, levees, and early evacuation all                                                                              a. protect people from floods b. warn people a flood is coming c. make it easier to rebuild after a flood d. protect natural habitat

It might be concluded that they help protect people from floods (option A). In the case of evacuation, it will be used when the phenomenon is happening so people can be rescue and they might no suffer serious damages. As regards, dams and levees, they are constructed in strategic places in order to control and regulate water as well as to produce energy.