(A) 1 term
(B) 2 terms
(C) ** 3 terms
(D) 4 terms
EXPLANATIONS BELOW
Concept note-1: -A member of the Democratic Party, he was the first African-American president of the United States. Obama previously served as a U.S. senator from Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004, and previously worked as a civil rights lawyer before entering politics.
Concept note-2: -Illinois Governor Rod Blagojevich appointed Burris to replace President-elect Barack Obama as the junior senator from Illinois. The appointment was controversial, as the governor was already under investigation and there were rumors of his being paid for the appointment.