Consider an ideal Brayton cycle executed between the pressure limits of 1200 and 100 kPa and temperature

Question:

Consider an ideal Brayton cycle executed between the pressure limits of 1200 and 100 kPa and temperature limits of 20 and 1000°C with argon as the working fluid. The net work output of the cycle is
(a) 68 kJ/kg
(b) 93 kJ/kg
(c) 158 kJ/kg
(d) 186 kJ/kg
(e) 310 kJ/kg