单选题
We may infer that a change in class relationships after the close of the Middle Ages produced greater productivity because ______.
A、
freemen had incentive to produce more
B、
masters had greater incentive to work their workers harder
C、
slaves never starved, no matter what they produced
D、
productivity could go in only one direction
【正确答案】
A
【答案解析】
从整篇文章推论出答案，整篇文章都在谈中世纪对人的束缚，因此中世纪后生产力大发展必是因为解放劳动力的原因。
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