【单选题】

Gold which is 10 Karats in proportion ______ in the U.S.
A．represents the highest grade of gold

B．cannot be sold
C．never carries a Karat quality mark
D．represents the lowest-grade gold marketable

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根据网考网移动考试中心的统计，该试题：

4%的考友选择了A选项

10%的考友选择了B选项

12%的考友选择了C选项

74%的考友选择了D选项

Gold which is 10 Karats in proportion ______ in the U.S.A．represents the highest grade of gold