A

To determine the net work done by the gas on the surroundings, we can apply the formula for work done by a gas during expansion:

\( W = P \Delta V \)
where:
- \( W \) is the work done by the gas,
- \( P \) is the pressure (in Pa),
- \( \Delta V \) is the change in volume (in m³).

We know that:
- The pressure, \( P = 100 \text{ kPa} = 100,000 ext{ Pa} \)
- The volume increase, \( \Delta V = 0.002 ext{ m}^3 \)

Substituting these values into the formula:
\[ W = 100,000 ext{ Pa} \times 0.002 ext{ m}^3 = 200 \text{ Joules} \]
Therefore, the net work done by the gas on the surroundings is 200 Joules.