A biography written with personal knowledge
The poet's use of quotation marks and dramatic shift in word choice in this excerpt from "Attack the Water" suggest that these words are coming from another source, such as the news.
This accounts for the change in word choice, as the news, would have been written or spoken by someone else. Also, adding this to the poem helps describe the situation in Vietnam from an outside standpoint.
Answer:
The volume of a cone is 1/3 that of a cylinder.
Explanation:
The volume of a cylinder is 
The volume of a cone is 
Therefore, the volume of a cone is 1/3 that of a cylinder.
C. It demonstrates how miserable she felt.
Zitkala-Sa was put through many tortures, based on this excerpt. It is clear that she was taken away from her mother young, and that her captors did terrible things to her like tie her to a chair and cut off one of her braids. If she was treated like this, it serves as an example for how the rest of her people were probably also treated.