Dry air is sent over heated copper until every bit of the oxygen has reacted. At the end of the reaction, the gas volume 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$570\,\text{cm}^3$