When a poet changes the meter in a poem, it forces the reader to emphasize key words. D is the correct option.
By changing the meter, there is a shift in the accentuation pattern which automatically emphasizes some parts of the lines.
Meter creates a specific rhythm to a poem. When the meter changes, the reader will have to stops or slows down while reading the poem which emphasizes any key words.
Personification is the figure of speech in which the human characteristics are attributed to non-human things. The abstract qualities of humans are intended in non-human things. In the above lines of the poem "Song of Myself" written by Walt Whitman, the hawk has been personified as a person. The qualities of complaining and accusing are attributed in the hawk.