Which of the following statements best characterizes the U.S. response to environmental issues under the Obama administration?

a. The Obama administration did not address environmental issues in the 2008 election campaign because of the ongoing financial crisis, but since winning reelection in 2012, it has undertaken comprehensive domestic reforms while pushing Congress to ratify the Kyoto Protocol and other international regulations regarding environmental problems such as climate change.
b. The Obama administration has been largely quiet on addressing environmental issues from a domestic approach, preferring instead to act through international law, such as the Kyoto Protocol and the EU’s cap-and-trade program.
c. The Obama administration championed widespread environmental protection policies as part of its 2008 election campaign but made no real proposal to reform any existing laws regarding environmental issues.
d. While Obama had limited success in addressing environmental issues during his first months in office, such as greater fuel efficiency requirements for automobiles and a prohibition of expanded oil drilling on public lands, the global financial crisis and efforts to enact reformed health care legislation caused the Obama administration to largely abandon its environmental efforts.

d. While Obama had limited success in addressing environmental issues during his first months in office, such as greater fuel efficiency requirements for automobiles and a prohibition of expanded oil drilling on public lands, the global financial crisis and efforts to enact reformed health care legislation caused the Obama administration to largely abandon its environmental efforts.