Why does the author uses rhetorical modes in writing

Rhetorical modes help the author convey their message to their audience. Many stories, even nonfiction ones, have some type of moral or bigger message. Rhetorical modes such as narration help explain the message through the eyes of a character, while others such as compare/contrast help illustrate different scenarios in which the message might play out.

as much wood as a woodchuck could chuck if a woodchuck could chuck wood.

sadly it cannot chuck wood

the correct answer is d. a discussion of specific uses of alliteration

.

when you are critiquing or evaluating a poem, you will mostly pay attention to the theme, as well as figures of speech and rhythm. alliteration is a figure of speech where consonants are repeated in neighboring words - and it is important for analysis of sound and rhythm, which is why it might appear in the evaluation of that poem.