og13 96状语从句的省略的疑问

wangwwzzyy

Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, thev are named for the New Mexico site where they were first discovered in 1932.

(A) Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, they are named for the New Mexico site where they were first discovered in 1932.
(B) Although named for the New Mexico site where first discovered in 1932, Clovis points are spear points of longitudinal grooves chipped onto their faces and have been found all over North America.
(C) Named for the New Mexico site where they have been first discovered in 1932, Clovis points, spear points of longitudinal grooves chipped onto the faces, have been found all over North America.
(D) Spear points with longitudinal grooves that are chipped onto the faces, Clovis points, even though named for the New Mexico site where first discovered in 1932, but were found all over North America.
(E) While Clovis points are spear points whose faces have longitudinal grooves chipped into them, they have been found all over North America, and named for the New Mexico site where they have been first discovered in 1932.

C选项虽然主要是句意错误，但是OG还说where first discovered应该改成where they were first discovered，但我觉得这里状语从句的省略是可以的，主句主语Clovis points就是状语从句主语，从句也是有be动词，这里不可以省略的原因是 Although named for the New Mexico site这里已经省略了还是别的原因呢？求解答

wangwwzzyy

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