For members of the seventeenth-century Ashanti nation in Africa, animal-hide shields with wooden frames were essential items of military equipment, a method to protect warriors against enemy arrows and spears.
(A) a method to protect
(B) as a method protecting
(C) protecting
(D) as a protection of
(E) to protect
答案自然是C,但是OG的官方解释是说:现在分词开头的状语从句修饰主句的Item,那岂不是说状语从句的逻辑主语可以不与主句一致么??
请各位牛牛解惑。