单选题
The word "investors" (in boldface in Paragraph 2) most exactly refers to those who ______.
A、
serve as the main source of finance to the state
B、
invest money in developing local colleges
C、
sponsor colleges and their educational programs
D、
join the plan and pay the tuition is advance
【正确答案】
D
【答案解析】
第二段告诉读者：科罗拉多州已经向新的投资者关闭预付大学学费项目(prepaid plans)，并告诉现有投资者该项目可能无法承担将来的学费增长。所以investors指的是加入预付大学学费项目、预先交纳大学学费的人。因此正确答案是D。
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