_______ are the problems that arise due to the construction of big dams.

Concept: The big dams provide us with the facility to collect rainwater. Though they help us in so many ways, some major problems arise due to the construction of big dams such as destruction of trees, aquatic species are getting affected, the natural ecosystem gets disturbed, and deforestation. Therefore, the correct answer is all of the above. 

Hence, the correct answer is option D.