172. 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
(E) who had been herself as an escaped slave, returned again and again to Maryland for the guiding of

Solution:

Redundancy*

B and D can be eliminated for wrong use of “so as to”.
C and E can be eliminated for unnecessary use of ‘ing’ form.
A is the best choice.

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