2.0 L of $$\text{N}_2$$ gas kept at $$25^\circ\text{C}$$ and 5 atm pressure were expanded isothermally against a constant pressure of 1 atm until the pressure of the gas reaches 1 atm. Assuming ideal behaviour, work of expansion in this process (in J) is close to

A

810 J

B

194 kJ

C

$$-810\ \text{kJ}$$

D

3390 kJ