This problem can be solved by using oxidation states. The oxidation state  is based on the electrons an atom loses or gain, or appears to use when forming compounds.To find the formula for Copper (I) Sulfide, we have to first consider the individual ions that come together to form it. Copper (I) is an ion of copper that has a charge of  +1, i.e. Sulfur is an element in group 6 of the periodic table. The sulfur ion has a charge of  -2, i.e.  To form Copper (I) Sulfide, which is electrically neutral, we need 2 Copper (I) ions and 1 sulfur ion..The reaction is represented by the equation below.The correct answer is (C)...

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