求助狒狒逻辑 一题

calina

A rise in thepercentage of all 18-year-olds who were recruited by the armed services of asmall republic between 1980 and 1986 correlates with a rise in the percentageof young people who dropped out of high school in that republic. Since18-year-olds in the republic are generally either high school graduates or highschool dropouts, the correlation leads to the conclusion that the republic’srecruitment rates for 18-year-olds depend substantially on recruitment ratesfor high school dropouts.
Which one of thefollowing statements, if true, most weakens the argument?
(A) A large numberof 18-year-old high school graduates were recruited for the republic’s armedservices in 1986 than in 1980.
(B) Many of thehigh-technology systems used by the republic’s armed services can be operatedonly by individuals who have completed a high school education.
(C) Between 1980and 1986 the percentage of high school graduates among18-year-olds recruited in the republic rose sharply.
(D) Personnel ofthe republic’s armed services are strongly encouraged to finish their highschool education.
(E) The proportionof recruits who had completed at least two years of college education wasgreater in 1986 than in 1980.


答案是C，不过没怎么看懂，请各位帮忙！

sdcar2010

correlation vs. causation.

There are two sources of 18-year-olds for arm recruits. The argument says the source is the dropouts. The weakening statement says otherwise.