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

(A) act as a buffer, so that it absorbs

(B) act like a buffer so as to absorb

(C) act as a buffer, absorbing

(D) acting as a buffer, absorbing（C）

(E) acting like a buffer, absorb

我想知道 A，B 中的SO THAT 和 SO AS TO 有没有错误？？？

谢谢啊