(A) Donald Trump
(B) ** Barack Obama
(C) George W. Bush
(D) Hillary Clinton
EXPLANATIONS BELOW
Concept note-1: -On November 4, 2008, Obama defeated the Republican nominee, Senator John McCain of Arizona, making him the President-elect and the first African American elected President. He was the third sitting U.S. Senator, after Warren G. Harding and John F. Kennedy, to be elected president.
Concept note-2: -When Barack Obama was elected president in 2008, he became the first African American to hold the office.
Concept note-3: -Obama–Biden ticket Following U.S. Democratic presumptive presidential nominee Barack Obama’s selection of Biden, the Senator’s vice-presidential general election campaign began. During the campaign, he used his political experience to complement Obama, and debated Republican Vice Presidential nominee Sarah Palin.