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答案應該是Ｃ

文意才對

這句其實是The Central Bank exercises general authority over the banking and financial system in Taiwan and exercises supervision over the banking and financial system in Taiwan. 

如果用原答案， The Central Bank exercises general authority and supervises over the banking and financial system in Taiwan. 

句子就沒有說明“exercise general authority" 是針對什麼事物行使權力

文意變成：

央行行使權力且監督台灣的因行事務、經濟事務

我解釋and 連接詞 ，詞性相同

  authority(n)  and supervision (n)

答案 只能是名詞。

(A) supervises(v)
(B) supervising(v-ing)
(C) supervision(n)
(D) superbly(adv)