The correct options are
B The leaves of the trees help bring water through the process of transpiration.
D Water percolates deep into the ground as the trees make the soil loose, which further helps increase groundwater levels.
Transpiration is the process of water movement through a plant and its evaporation from aerial parts such as leaves, stems, and flowers. As the water evaporates with the help of trees, it comes back in the form of rain, and the excess rainwater percolates deep into the Earth with the help of the pores in the soil, which occur due to tree roots.