Which set of coefficients will balance this chemical equation?

__PbS(s) + __O2(g) → 2PbO(s) + 2SO2(g)

The balanced chemical equation for this reaction is:

2PbS(s) + 3O2(g) → 2PbO(s) + 2SO2(g)

Therefore, the set of coefficients that will balance the equation is:

2, 3, 2, 2