Magnesium Burns in Air with a Dazzling Brilliance to Produce

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s) + (g) → 2MgO(s)
How many moles of are consumed when 0.850 mol of magnesium burns?

A) 1.70
B) 0.850
C) 0.0350
D) 0.559
E) 0.425