Wetland ecosystems are habitats for a wide variety of animal and plant species. They provide benefits to ecosystems such as nutrient recycling and water filtration.

A certain wetland has been partially drained to build buildings. The wetland has also been polluted by pesticides entering from nearby farms. This has caused the biodiversity of the wetland to decrease. What is the best solution to improve the biodiversity of this wetland?
A.
building neighborhoods around the edges of the wetland to increase human activity
B.
building a buffer of plants around the wetland to reduce runoff from entering the ecosystem
C.
using both synthetic fertilizers and pesticides on the crops that are grown on nearby farms
D.
moving the plants in the wetland to another location that is protected by conservation laws