9 A genuine sterling silver items is 92.5% silver by mass. This means that:
A. 92.5 g is silver and 7.5g is another metal (usually copper)
B. 0.5 g is silver and 92.5g is another metal (usually copper)
C. 46.25g is silver and 46.25g is another metal (usually copper)
D. none of the above

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