Combustion gases with k = 1.33 enter a converging nozzle at stagnation temperature and pressure of 400C

Question:

Combustion gases with k = 1.33 enter a converging nozzle at stagnation temperature and pressure of 400°C and 800 kPa, and are discharged into the atmospheric air at 20°C and 100 kPa. The lowest pressure that will occur within the nozzle is
(a) 26 kPa
(b) 100 kPa
(c) 321 kPa
(d) 432 kPa
(e) 272 kPa