The details of the passage develop the idea that Boxer was tireless. This is because he was very dedicated to the work of the animal farm and felt good doing it.
This excerpt is from Animal farm book.
It tells the story of a group of farm animals who rebel against their human farmer in hopes of creating a society where animals can be equal, free and happy. Eventually, the rebellion is betrayed and the farm ends up in the same bad state as before, under the dictatorship of a pig named Napoleon.
Hence, the correct answer is Option D
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