The correct choice is (d) Phytoremediation
The best explanation: Phytoremediation is a technique used to remove heavy metals in the environment using plants, so, that would lead to their reduction in the environment. Whereas, Copper, Zinc, manganese and molybdenum are the trace elements are found in Escherichia coli. E. coli can accumulate metals inside it’s cell by bacterial assimilation, these are among the 0.3 % of trace metals can be found in E. coli.