The correct answer is alternative D: "The United States should explore many different sources of energy."
The Republican Party is one of the two major political parties of the United States, and is the party of the current president Donald Trump. This party has elected many important presidents over the course of its history, such as Abraham Lincoln, Theodore Roosevelt, Dwight Eisenhower, Richard Nixon, Ronald Reagan and George Bush senior and son.
Through history this political parties has expressed its desire to explore alternative sources of energy so as to achieve energy independence from other nations.
For this reason, the correct alternative is letter D.
