The roots of the mangrove trees provide food and shelter for many organisms, and keep sand, mud, and organic matter in place, preventing erosion and local flooding. Which of the following environmental changes would have the greatest impact on the coastal community?

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.