A High Temperature Reaction Vessel Is Charged with 0

Multiple Choice

A high temperature reaction vessel is charged with 0.5080 mol of iron powder and 42.1 L of oxygen gas at standard temperature at pressure.On heating,the iron and oxygen react according to the balanced reaction below.
4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)
After the reaction vessel is cooled,and assuming the reaction goes to completion,what volume of oxygen remains?

A) 33.5 L
B) 42.1 L
C) 26.9 L
D) 8.53 L
E) 0.254 L