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

Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: Cu₂S(s) + O₂(g) → 2Cu(s) + SO₂(g)
If the reaction of 0.760 kg of copper(I) sulfide with excess oxygen produces 0.310 kg of copper metal,what is the percent yield?

A) 102 %
B) 39.9 %
C) 40.8 %
D) 204 %
E) 51.1 %