The piston in a gas supply pump has a cross-sectional area of $600\,\text{cm}^2$, and in one stroke it travels $40\,\text{cm}$. The pump pushes the gas against a constant pressure of $5000\,\text{Pa}$. What amount of work is carried out by the piston in one stroke?
- A$1.2 \times 10^2\,\text{J}$
- B$1.2 \times 10^4\,\text{J}$
- C$1.2 \times 10^6\,\text{J}$
- D$1.2 \times 10^8\,\text{J}$