Pure Copper May Be Produced by the Reaction of Copper(I)sulfide $\to$

Multiple Choice

Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows:
Cu₂S(s) + O₂(g) $\to$ 2Cu(s) + SO₂(g)
If the reaction of 0.630 kg of copper(I) sulfide with excess oxygen produces 0.190 kg of copper metal,what is the percent yield?

A) 75.5 %
B) 39.9 %
C) 30.2 %
D) 151 %
E) 37.8 %