Answer:
If any, it would be the last line (Clover thinks that if Boxers continues working so hard etc.) providing the correct answer.
Step-by-step explanation:
Clover and Boxer (horses) present the working class animals in Animal Farm by George Orwell, ruled by the pig Napoleon. After Boxer is hurt in the battle with the humans, Clover takes care of him and tries to get him to slow down. Eventually he collapses on the job and is delivered to the horse slaughterer.