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 b. banked with dirt as high as that ofc. banked them with dirt to a height ofd. was banked with dirt as high ase. was banked with dirt as high as that of

The right answer is the A) "... banked with dirt to a height of..."

Explanation: Just to elaborate a little on the answer, it can be added that this is the choice with the most grammatically correct structure. Options D and E should be discarded, primarily because they unnecessarily repeat the verb "was." In addition, option C can also be discarded, since the pronoun "them" is incorrectly used—the verb "banked" is referring to the framework of poles, and this is singular. Finally, option B should also be discarded, since the phrase would require the use of a comparative element—"as that of a three feet high table," for instance.

b. b. b. is the anoswer