An environmental issue associated with in south and southeast asia includes the unnatural distribution of sediments, which may lead to flooding . a. slash-and-burn farming b. dam building c. aquaculture d. coal mining

The answer is 
B. Dam Building

The correct answer is B. dam building.
A and D don't really have much to do with flooding. Aquaculture cannot lead to the unnatural distribution of sediments. B is the correct answer because if dams are built incorrectly, they can cause many problems, such as flooding (which they are supposed to prevent), as well as problems with sediments.

Its in the national history museum and you can't se the original because its locked away in a vault