In an interpretive literary essay, what is the purpose of commentary in body paragraphs?

commentary mentions and properly credits the author of a quotation.
commentary ensures that evidence properly fits into a paragraph.
commentary explains how evidence supports the writer's viewpoints.
commentary introduces the reasons for the writer’s thesis and viewpoint.

Which excerpt from rudyard kipling’s the white man’s burden conveys

Brutus: but as he was ambitious, i slew him. . who is here so base that would be a bondman? if any, speak, for him have i offended. who is here so rude that would not be a roman? if any, speak, for him have i offended. who is here so vile that will not love his country? if any, speak, for him have i offended. i pause for a reply. which rhetorical device does brutus use in this excerpt?

10. what is the purpose of the introduction in an essay? a. to establish the main idea of the essay. b. to focus on current statistics c. to explain the main idea to the reader d. to highlight the most important concepts