(A) 22th
(B) 12th
(C) 20th
(D) ** 44th
EXPLANATIONS BELOW
Concept note-1: -Barack Obama served as the 44th President of the United States. His story is the American story-values from the heartland, a middle-class upbringing in a strong family, hard work and education as the means of getting ahead, and the conviction that a life so blessed should be lived in service to others.
Concept note-2: -He was elected the 44th President of the United States on November 4, 2008, and sworn in on January 20, 2009. After being re-elected in 2012, President Obama is currently serving his second and final term, which will end in January 2017.