Which choice best describes the overall structure of the text?

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While many initiatives aimed at limiting atmospheric warming focus on curbing emissions of methane (CH4), a greenhouse gas that is typically generated by microbially mediated processes, Lisa Y. Stein and Mary E. Lidstrom caution that under certain circumstances, such efforts cause microbial communities to accelerate production of nitrous oxide (N2O), another potent greenhouse gas, thus offsetting the impact of CH4 reduction. Researchers, therefore, need to take such biological interactions into account to ensure that any CH4 mitigation strategy has an overall positive climate effect.

It mentions a phenomenon that negatively affects the environment, summarizes competing methods for remedying that phenomenon, and then concedes that even apparently distinct methods share similar problems.

It describes a widely accepted approach to addressing an environmental issue caused by a type of chemical emissions, indicates a potential disadvantage of that approach, and then discusses an implication of that disadvantage

It reports on a predicament resulting from emissions of a particular greenhouse gas, outlines a strategy aimed at solving that predicament, and then admonishes those who utilize that strategy without fully comprehending its ramifications.

It presents an ongoing environmental challenge, demonstrates why the impact of that challenge may intensify over time, and then criticizes a misguidedly narrow attempt to address that impact