单选题：根据下面资料，回答题 For years, studies have found that first-generati

根据下面资料，回答题
For years, studies have found that first-generation college students--those who do not have aparent with a college degree--lag other students on a range of education achievement factors. Theirgrades are lower and their dropout rates are higher. But since such students are most likely to advanceeconomically if they succeed in higher education, colleges and universities have pushed for decades torecruit more of them. This has created "a paradox" in that recruiting first-generation students, but
then watching many of them fail, means that higher education has "continued to reproduce andwiden, rather than close" an achievement gap based on social class, according to the depressingbeginning of a paper forthcoming in the journal Psychological Science.
But the article is actually quite optimistic, as it outlines a potential solution to this problem, suggesting that an approach (which involves a one-hour, next-to-no-cost program) can close 63 percentof the achievement gap (measured by such factors as grades) between first-generation and otherstudents.
The authors of the paper are from different universities, and their findings are based on a studyinvolving 1~,7 students (who completed the project) at an unnamed private university. First generationwas defined as not having a parent with a four-year college degree. Most of the first-generationstudents(59.1 percent) were recipients of Pell Grants, a federal grant for undergraduates with financial need, while this was true only for 8.6 percent of the students with at least one parent with a fouryear degree.
Their thesis--that a relatively modest intervention could have a big impact--was based on theview that first-generation students may be most lacking not in potential but in practical knowledgeabout how to deal with the issues that face most college students. They cite past research by severalauthors to show that this is the gap that must be narrowed to close the achievement gap.
Many first-generation students "struggle to navigate the middle-class culture of higher education,learn the ' rules of the game, ' and take advantage of college resources, " they write. And this becomesmore of a problem when collages don't talk about the class advantages and disadvantages of differentgroups of students. "Because U. S. colleges and universities seldom acknowledge how social class can
affect students'educational experience, many first-generation students lack insight about why they arestruggling and do not understand how students ' like them' can improve. "
Recruiting more first-generation students has_______. A．reduced their dropout rates
A．reduced their dropout rates
B．narrowed the achievement gap
B．narrowed the achievement gap
C．missed its original purpose
C．missed its original purpose
D．depressed college students
D．depressed college students