The single-family house constructed by the Yana, a Native American people who lived in what is now northern California, was conical in shape, its framework of poles overlaid with slabs of bark, either cedar or pine, and banked with dirt to a height of three to four feet.
(A) banked with dirt to a height of
-- Correct choice
(B) banked with dirt as high as that of
-- we can't use that
(C) banked them with dirt to a height of
-- them is not needed here
(D) was banked with dirt as high as
-- changes
...
(A) banked with dirt to a height of
-- Correct choice
(B) banked with dirt as high as that of
-- we can't use that
(C) banked them with dirt to a height of
-- them is not needed here
(D) was banked with dirt as high as
-- changes
...
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