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The first step in PCB degradation requires an unusual dechlorination reaction. Imagine that you are conducting a long-term study of a PCB-affected site and detect organisms capable of PCB dechlorination. This is intriguing because none had been detected at the same site 20 years earlier. What is the best explanation for your finding?Choose one:A. PCB dechlorinators from nearby areas detected the PCBs and migrated to the site using chemotaxis.B. PCB dechlorinators were always present in very small (i.e., nondetectable) numbers but became selectively enriched over time.C. Bacteria at the site detected a novel substrate and evolved the necessary pathways to use it. D. The PCBs induced elevated rates of mutation in resident microbes that resulted in the evolution of PCB-degrading abilities.

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