In a plan to stop the erosionof East Coast beaches, the Army Corps of Engineers proposed building parallelto shore a breakwater of rocks that would rise six feet above the waterline andact as a buffer, so that it absorbs the energy of crashing waves and protectingthe beaches.

(A) act as a buffer, so thatit absorbs

(B) act like a buffer so as toabsorb

(C) act as a buffer, absorbing

(D) acting as a buffer,absorbing

(E) acting like a buffer,absorb

答案是C 没有疑问。

我想问的是-ing表伴随状态的一个问题

这里的ABSORBING 有没有伴随 主句主语 the army corp的歧义呢？