(A) ** 2007
(B) 2003
(C) 2015
(D) 2016
EXPLANATIONS BELOW
Concept note-1: -On February 10, 2007, Barack Obama, then-junior United States senator from Illinois, announced his candidacy for the presidency of the United States in Springfield, Illinois. Obama announced his candidacy at the Old State Capitol building, where Abraham Lincoln had delivered his “House Divided” speech.
Concept note-2: -The day after Obama’s acceptance speech at the Democratic National Convention, Obama’s Republican opponent, Arizona Senator John McCain, announced his selection of Alaska Governor Sarah Palin as his running mate.
Concept note-3: -In 2008, after a close primary campaign against Hillary Clinton, he was nominated by the Democratic Party for president and chose Joe Biden as his running mate. Obama was elected over Republican nominee John McCain in the presidential election and was inaugurated on January 20, 2009.