A paragraph is given below from which the last sentence has been deleted. From the given options,choose the one that completes the paragraph in the most appropriate way.
Here are a few scenes from a revolution: In early February, Barack Obama ended a six-month pressconference drought by taking questions from YouTube. When a madman crashed his plane into a
Texas office building a couple of weeks later, the White House responded on its blog.
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(a) In response, Obama’s advisers have had to remake the rules of presidential p.r.
(b) But the White House has proved to be a harder perch from which to dominate the conversation.
(c) During the 2008 campaign, Obama’s team had been able to exploit new technologies as no political campaign had before.
(d) And during the bipartisan summit on health reform, press secretary Robert Gibbs used Twitter to keep score.