根据以下材料，回答31-35题
Since the beginning of the Great Recession in 2007, the history major has lost significant market share in academia,declining from 2.2% of all undergraduate degrees to 1.7%.The drop is most pronounced at large research universities and prestigious liberal arts colleges.
This is unfortunate—not just for those colleges, but for our economy and society.
of course it's not just history.Students also are slighting other humanities disciplines including philosophy,literature, linguistics and languages.Overall, the core humanities disciplines constituted only 6.1% of all bachelor's degrees awarded in 2014, the lowest since 1948.
Conventional wisdom offers its usual simplistic answers for these trends：Students choose fields more likely to yield high-paying employment right after graduation—something "useful", like business, or technology-oriented.History looks like a bad bet.
Politicians both draw on those simplicities and perpetuate them.Governors oppose public spending on "useless" college majors.History, like its humanistic peers, might prepare our young people to be citizens, but it supposedly does not prepare workers—at least not well paid ones.
Over the long run, however, graduates in history and other humanities disciplines do well financially.Rubio would be surprised to learn that after 15 years, those philosophy majors have more lucrative careers than college graduates with business degrees.History majors' mid-career salaries are on par with those holding business bachelor's degrees.
Labor markets are now unstable and unpredictable.In this environment—especially given the expectation of career changes—the most useful degrees are those that can open multiple doors, and those that prepare one to learn rather than do some specific thing.
All liberal arts degrees demand that kind of learning, as well as the virtues of critical thinking and clear communication skills.History students, in particular, sift through substantial amounts of information, organize it, and make sense of it.In the process they learn how to infer what drives and motivates human behavior from elections to social movements to board rooms.
Employers interested in recruiting future managers should understand that historical thinking prepares one for leadership because history is about change—envisioning it, planning for it, making it last.
Everything has a history.To think historically is to recognize that all problems, all situations, all institutions exist in contexts that must be understood before informed decisions can be made.No entity—corporate, government, nonprofit—can afford not to have a historian at the table.We need more history majors, not fewer.
History and other humanities disciplines are considered not useful because

A students do not think they are worth the investment

B their graduates will not find jobs after graduation

C students find it is difficult to be awarded degrees

D the income cannot be guaranteed in the long run