问题详情

Why does the author say that even gold and silver were inconvenient if you had to buy some- thing expensive？ 查看材料
A.Because they are easy to steal.
B.Because they are difficult for people to obtain.
C.Because they are not easy to carry around.
D.Because they themselves are expensive， too.请帮忙给出正确答案和分析，谢谢！