Longfellow challenged the white man's assessment of American Indians as savages unable to learn--through his writing.
Which is the correct way to revise this sentence?
A. Longfellow challenged the white man's assessment of American Indians--as savages unable to learn--through his writing.
B. Longfellow challenged the white man's assessment of American Indians: as savages unable to learn through his writing.
C. Longfellow challenged the white man's assessment of American Indians; as savages unable to learn, through his writing.
D. No change