A constant amount of an ideal gas undergoes the cyclic process \( A...

A constant amount of an ideal gas undergoes the cyclic process \( A B C A \) in the \( P V \) diagram shown below. The path \( \mathrm{BC} \) is an isothermal. The work done by the gas during one complete cycle, beginning and ending at \( A \), is nearly
\( \mathrm{P} \)
(a) \( 600 \mathrm{~kJ} \)
(b) \( 300 \mathrm{~kJ} \)
(c) \( -300 \mathrm{~kJ} \)
(d) \( -600 \mathrm{~kJ} \)
W
\( V\left(m^{3}\right) \)