You are correct, the answer is C) IP bleed system. The auxiliary exhaust system shown in the illustration can be supplied by steam from the IP (Intermediate Pressure) bleed system. This is because the IP bleed system taps into the steam turbine at an intermediate pressure point, providing a source of high-pressure steam that can be used to power the auxiliary exhaust system. The other options are incorrect because the distilling plant (A) and the turbo generators (B) are not directly connected to the steam supply for the auxiliary exhaust system, and the LP (Low Pressure) bleed system (D) would not provide the necessary high-pressure steam required for the auxiliary exhaust system.