Read the Following Scenario and Answer the Question Below

Read the following scenario and answer the question below.
The Intergovernmental Panel on Climate Change reports that physical, biological, and economic evidence exists confirming global climate change due to human -produced greenhouse gases. Although the United States emits most of Earthʹs carbon dioxide, its policies do not reflect concern over its environmental effects. The United States failed to ratify the Kyoto Protocol, an international agreement signed by other developed nations to reduce carbon dioxide emissions. Requested voluntary reductions of carbon dioxide emissions have not been effective in reducing greenhouse gases. Revisions to the 1970 Clean Air Act, called the ʺClear Skies Initiative,ʺ were proposed to limit mercury, nitric oxides, and sulfur oxide emissions from power plants. Nicknamed by Robert F. Kennedy, Jr., as the ʺClear Lies Initiative,ʺ this proposal did not specifically address emission of carbon dioxide, and its loopholes precluded older power plants from modernizing, seemingly supporting polluting industries with political influence. Environmentalists are arguing for immediate action, including stricter laws to limit power plant carbon dioxide emissions and provide subsidies for renewable energy. They favor ʺportfolio standards,ʺ requiring electric companies to provide clean energy alternatives to consumers and ʺgreen tags,ʺ
ʺwind certificates,ʺ and ʺgreen pricingʺ to support the use of alternative fuels.
-One factor contributing to U.S. resistance to legal intervention regarding global climate change is ______________.

A) lack of scientific evidence supporting global climate change
B) political influence of the petroleum, coal and automobile industries
C) the precautionary principle
D) lack of support from other developed nations around the world
E) the success of voluntary reductions of carbon dioxide emissions by U.S. power plants