British Sterling Silver Is a Copper-Silver Alloy That Is 7

British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 157 grams of a copper-silver alloy that is 9% copper by weight?

A) 154.5 g of British sterling silver and 2.5 g of copper.
B) 148.4 g of British sterling silver and 8.6 g of copper.
C) 142.9 g of British sterling silver and 14.1 g of copper.
D) 134.3 g of British sterling silver and 22.7 g of copper.
E) 155.8 g of British sterling silver and 1.2 g of copper.