A university wishes to conduct a scientifically accurate public-opinion poll about a piece of environmental legislation. Which of the following questions would best elicit accurate polling data?

A useful poll question should ask about a clear, specific policy. Choice D identifies who would be responsible and what they would pay for: oil companies would cover the cost of cleaning up oil spills. Choices A and B are broad, while C uses a technical emissions limit that many respondents may not understand.

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