Answer: b. Move residents to higher ground across the river.
Step-by-step explanation:
Fighting flood is a tough task most low land communities tend to face, these takes up houses and business, these is as a result of the house being built at the same level of the water and it makes it easier for the water to come back for them. The best and reachable way to solve these situation is to move all citizens occupying houses and businesses in low land region to those region that are high above the water level, irrespective of any form of flood.