![](https://lstatic.shangxueba.com/jiandati/h5/images/m_q_title.png)
According to Paragraph 2, why did the gold coins used in the United States before 1933 bel
A.Because they were made of the precious metal gold and hence very valuable.
B.Because they could be used to exchange commodities and were called commodity money.
C.Because the value of a coin was the same as the value of the gold in the coin.
D.Because the value of the gold contained in a coin was more than the value of the coin.