The correct answer is A.
The graph depicts the number of Tweets written and published online in relation to the campaigns for the US presidential elections in 2008 and then in 2012. The number has triplicated. It has risen from 10 million to more than 30 million Tweets.
Therefore these figures evidence the major importance that social networks such as Twitter have acquired in political campaigns.
Still not finished is there more to this?
Marbury v. Madison, legal case in which, on February 24, 1803, the U.S. Supreme Court first declared an act of Congress unconstitutional, thus establishing the doctrine of judicial review.
I would say B) and D) apply to some of the differences between a Prime Minister and a President and also A). In addition, a Prime Minister is head of the government but may not be head of the state which may be a President in the same country or perhaps a Governor General.
