单选题 The writer of this passage refers to the history of money in order to ______________.

A、 show that silver and gold are previous metals
B、 show that one should convert paper money to gold
C、 explain the nature of money
D、 show that anything can serve as money in modem times

【正确答案】 C

【答案解析】[解析]从文章第三段：If we were to study the history of money，we would find that in different places and at different times a variety of things have been used as money...得知。故本题答案为C。