Part or all of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A.

　　In Costa Rica, coffee, from the highlands, and bananas, produced mainly in the Caribbean lowlands, as the most important crops, they account for nearly half the total value of all exports.

　　(A) as the most important crops, they account

　　(B) as the most important crops, which account

　　(C) are the most important crops, accounting

　　(D) are the most important of their crops by accounting

　　(E) have been the most important crops, which accounts

　　Explanation

　　Choice (C) is correct. It avoids the error of the original by providing a main verb ("are") to agree with the subject of the sentence, "coffee … and bananas."

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（编辑：马菲）