PREP 1-7 请教

7.    (24887-!-item-!-188;#058&001530)

Obtaining an investment-grade rating will keep the county's future borrowing costs low, protect

its already-tattered image, and increase its ability to buy bond insurance.

(A) Obtaining an investment-grade rating will keep the county's future borrowing costs low,

protect

(B) To obtain an investment-grade rating will keep the county's future borrowing costs low, and

protect

(C) Having obtained an investment-grade rating will, in keeping the county's future borrowing

costs low, protect

(D) To obtain an investment-grade rating would keep the county's future borrowing costs low,

protecting

(E) Obtaining an investment-grade rating, keeping the county's borrowing costs low, would be

protecting 

答案是A，但是有一个疑问，句中后面有两个its，用来指代the country's，但是这样是否有指代不清之嫌？