In "Animal Farm" by George Orwell, Boxer represents the proletariat, that is, the working class, as stated in option A and further explained below.
The different characters in "Animal Farm" all represent different counterparts in the real history of the Russian Revolution and the Soviet regime. The pigs, for example, represent the soviet leaders, such as Stalin.
When it comes to the horses, especially Boxer, they represent the working class, the proletariat. They are exploited by the leaders, all in the name of a utopia, an idealized society that never comes to be.
With the information above in mind, we can choose option A as the correct answer for this question.
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