题目内容：
回答题Something about Vocation
If you like to take lots of vacation, the United States is not the place to work. Besides a handful of national holidays, the typical American worker gets two or three precious weeks off out of a whole year to relax and see the world--much less than what people in many other countries receive. And even that amount of vacation often comes with strings attached.
So what's going on here?
A big reason for the difference is that paid time off is demanded by law in many parts of the world. Germany is among more than two dozen industrialized countries -- from Australia to Japan -- that require employers to offer four weeks or more of paid vacation to their workers, according to a 2009 study by the human resources consulting company Mercer. Finland , Brazil and France are the champions, guaranteeing six weeks of time off. But employers in the United States are not obliged under federal law to offer any paid vacation, so about a quarter of all American workers don't have access to it, government figures show. That makes the U. S. the 0nly advanced nation in the world that doesn't guarantee its workers annual leave.
Most U. S. companies, of course, do provide vacation as a way to attract and retain workers. But the fear of layoffs and the ever-faster pace of work mean many Americans are reluctant to be absent from the office-anxious that they might look like they're not committed to their job. Or they worry they won't be able to cope with a pile of work waiting for them after a vacation.
Then, there's the way we work.
Working more makes Americans happier than Europeans, according to a study published recently in the Journal of Happiness Studies. That may be because Americans believe more than Europeans do that hard work is associated with success.
So despite research documenting the health and productivity benefits of taking time off, a long vacation can be undesirable, scary, unrealistic or just plain impossible for many U. S. workers.
According to the passage, the United States is a nation __________ A．that prefers relatively longer vacations
B．that has fewer national holidays
C．where workers do not have paid time off
D．where employers are not required to offer paid vacation
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