A Researcher Studying the Impact of Agricultural Pesticides on Native

A researcher studying the impact of agricultural pesticides on native plants discovers a bacterium capable of degrading small amounts of a specific pesticide. The researcher then modifies the bacterial species in the lab to increase the rate of pesticide degradation. This research represents

A) applied microbiology.
B) food microbiology.
C) environmental microbiology.
D) both food microbiology and environmental microbiology.
E) both applied microbiology and environmental microbiology.