The work done by three moles of an ideal gas in the cyclic process $$ABCD$$ shown in the diagram is approximately. Given that $$T_1 = 100\ \text{K}$$, $$T_2 = 200\ \text{K}$$, $$T_3 = 600\ \text{K}$$ and $$T_4 = 300\ \text{K}$$.

A

$$7.5\ \text{kJ}$$

B

$$5.0\ \text{kJ}$$

C

$$2.5\ \text{kJ}$$

D

Zero