An ideal gas expands from $1 \times 10^{-3} \ m^{3}$ to $1 \times 10^{-2} \ m^{3}$ at $300 \ K$ against a constant external pressure of $1 \times 10^{5} \ Nm^{-2}$. The work done is:
- A$-9 \times 10^{2} \ J$
- B$-9 \times 10^{3} \ J$
- C$-0.7 \times 10^{3} \ J$
- D$-1 \times 10^{3} \ J$
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