阅读理解。阅读下面短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。
First lady Michelle Obama turns 50 on Friday, Jan. 17, 2014.
Michelle Obama has spent the first half-century of her life breaking barriers and checking off a series of firsts. Now, as she reaches her milestone birthday Friday, the nation will be watching to see in what other areas she will leave her mark.
Five years after moving into the White House, and without a re-election campaign to worry about, she has more room to relax in her role and, political watchers say, possibly become more vocal (声音的) on political issues in the three years left in office.
