[单项选择]Thus the difficulties of exchange led by degrees to the invention of money.
A. 这样，交换的困难在某种程度引起了钱的出现。
B. 这样，钱的出现在某种程度上引起厂交换的困难。
C. 这样，交换导致某种程度上的困难，引起了钱的出现。
D. 这样，交换的困难在不同程度上引起了钱的出现。

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