A fixed mass of gas occupies a volume of $1.2\,\text{m}^3$ at a pressure of $200\,\text{kPa}$. The gas then expands at constant temperature until its volume becomes $1.8\,\text{m}^3$. What is the gas pressure now?
- A$120\,\text{kPa}$
- B$130\,\text{kPa}$
- C$300\,\text{kPa}$
- D$600\,\text{kPa}$