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1.                             The nation’s three military academies have seen a dramatic rise in applications, one fueled by a resurgence of patriotism, increasing tuition costs at private colleges, and improved recruiting by the academies.

(A) one fueled by a resurgence of patriotism, increasing tuition costs at private colleges, and improved recruiting by the academies

(B) one fueled by a resurgence of patriotism, tuition costs that have increased at private colleges, and academies improving their recruiting

(C) one fueled by a resurgence of patriotism, private colleges that increased their tuition costs, and recruiting improvements by the academies

(D) fueled by a resurgence of patriotism, tuition costs increasing at private colleges, and academies improving their recruiting（A）

(E) fueled by a resurgence of patriotism, increasing tuition costs at private colleges, and academies improving their recruiting

过去分词做后置定语，我们以前都是就直接用了，这里为什么出现一个one?什么时候需要这个one，什么时候不需要，谢谢！