请教nn一道语法题...谢谢:)

The nation's three military academics 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 improvments by the academies

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

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

为什么是答案a 啊?   谢谢

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