One way in which wetlands control flooding is by a. filtering out water pollutants. b. absorbing water from rivers. c. providing habitats for migratory wildlife. d. reducing the amount of carbon dioxide released into the air.

The correct answer is option b.

One way by which wetland controls flood is by absorbing water from rivers. Wetland absorbs water and and store it. Afterwards it releases slowly. It behaves like a sponge. It also protects nearby houses flooding and vegetation too. It reduces the water flow and settles down the sediments and pollutants also.