单选题 Colorado now has told participants in the prepaid tuition plan that ______.

A、 they would not have to make any other payment later
B、 they would not be guaranteed against further payment
C、 the plan would cover further tuition increases
D、 the plan would be replaced by a guaranteed investment contract

【正确答案】 B

【答案解析】由Colorado has closed its prepaid plan to new investors and told existing ones that it may not cover future tuition increases可知正确答案是B(不能担保这些参加者们将来不再交费)。