Dry air is allowed to pass over hot copper until every trace of oxygen has reacted. The gas volume at the end of the reaction is $120\text{ cm}^3$. What was the initial volume of dry air?
- A$132\text{ cm}^3$
- B$152\text{ cm}^3$
- C$180\text{ cm}^3$
- D$570\text{ cm}^3$