单选题：下列现象最能体现春秋时期社会发展趋势的是（　　）

题目内容：

下列现象最能体现春秋时期社会发展趋势的是（　　） A．周王室势力衰微
B．铁器牛耕用于农业生产
C．公田转化为私田
D．少数民族进攻华夏小国

参考答案：

答案解析：

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