He doesn't want to be a toy the capitol uses for entertainment. With all the horrors he is about to go through, he knows he is going to change but he doesn't want to forget who he always was. He is a good person, and in the games good people are remodeled into killers. This is Peeta refusing to conform to the goverment's will.
This part of the excerpt seems to be correct as it reveals that the diet alone is responsible for his ninth birthday: "It had plenty of room to expand, thanks to the spare diet of the establishment; and perhaps to this circumstance may be attributed his having any ninth birth-day at all."
B. By showing evidence that represents what the speaker is talking about
They stress Columbus's determination and fearlessness.
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