In Clackamas, Oregon, a Stand of Hybrid Poplar Trees Was

In Clackamas, Oregon, a stand of hybrid poplar trees was planted on an area of land that is contaminated with volatile organic compounds (VOCs) . Why would someone purposely plant trees in an area with contaminated soil?

A) to use the trees as a means of phytoremediation
B) to use the trees as a means of eliminating insect species that consume nearby endemic plants
C) to use the trees for lumber for houses
D) to see if animals will make nests in trees that grow in contaminated soil.