Asking what effect the speaker is trying to produce in the listeners, rather than just cataloguing individual words, points to the same answer from a different direction.
A speech built to provoke that reaction has a critical, resentful tone, matching only the option that names both criticism and outrage.
Another reliable check is to imagine how the intended audience, the animals being addressed, would actually feel hearing this speech, and match the tone to that reaction.
The reaction this speech is built to produce, outrage and sorrow at mistreatment, matches only the critical, somber, resentful option.
So the correct answer is Critical, somber, and resentful, evoking both awareness and outrage.
One simple test for allegory versus a single figure of speech is whether the same comparison repeats across multiple examples or appears just once.
Because the comparison is sustained across several examples rather than appearing once, the correct label is allegory of class exploitation.
It also helps to check the pattern in this passage against what the source material as a whole is built to do.
Since the contrast fits the sustained political allegory the passage is built on, the correct option is the one naming that allegory.
So the correct answer is Allegory of class exploitation.
A fast way to compare near-identical options is to list what details the full, correct definition needs, then see which option is missing which piece.
'A slaughterer' is missing both details. 'A trader whose business is disposal of dead and unwanted animals' gets detail 1 but is missing detail 2. 'A person whose business is disposal of dead or unwanted animals especially those whose flesh is not fit for human consumption' includes both details in full. 'Harness-maker' is unrelated to either detail. Only the third option is complete, matching Boxer's fate of being processed for foxhound feed rather than human food.
Substituting each option back into the passage's own sentence about Boxer is a quick way to see which definition actually fits the scene being described.
Only the full, precise definition slots naturally into the passage's own description of Boxer's fate.
So the correct answer is A person whose business is disposal of dead or unwanted animals especially those whose flesh is not fit for human consumption.
Each repeated image is aimed at a specific listener in the room, which is a useful angle for checking the options.
Aimed this personally at the listeners, the repetition is built to provoke outrage at the brutality awaiting them, not to inform, reassure, or suggest they should accept it.
Since this speech's larger goal is to convince the animals to rise up, it helps to read the repeated violent images as a build toward that persuasive goal rather than as description for its own sake.
Given that the speech is building toward a call to resist, the repeated brutal imagery serves to evoke outrage at exploitation, which is the only option that fits that persuasive purpose.
So the correct answer is Evoke emotional outrage and highlight the brutality of exploitation.