请教 大全-172 先谢过

1.        Before the Civil War, Harriet Tubman, herself an escaped slave, returned again and again to Maryland to guide other slaves along the Underground Railroad to freedom.

(A) herself an escaped slave, returned again and again to Maryland to guide

(B) being an escaped slave herself, returned again and again to Maryland so as to guide

(C) an escaped slave herself, returned again and again to Maryland for guiding

(D) herself as an escaped slave, returned again and again to Maryland so as to be the guide of（A）

(E) who had been herself as an escaped slave, returned again and again to Maryland for the guiding of

可以请教一下 这个句子的结构么 特别是herself an escaped slave

选择a吗？这个herself时强调作yong.