单选题 What kind of stylistic device did the author use in the phrase "as pine roots cracking granite to grow"?

【正确答案】 B
【答案解析】[解析] 见第一段第二句话they were,as a group,…as pine roots cracking granite to grow。在整个句子中出现了表示明喻的特征词as,所以选B项。