Due to the fact that I have not read this book i would not be able to accurately answer this question however, I can offer a suggestion and that would be B.
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The school buses lined up like tanks on the battlefield. Obviously the school buses are not tanks and the school is not a battlefield. But in this occasion, the metaphor is used to describe the school as a battlefield, in that there are police forces keeping the angry people from attacking the black students, who are entering the buses to be taken home. (Buses being armored like tanks)
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Can you send me the blog? I can't answer the question without reading the material first.
This is an example of symbolism
