The correct answer is C) Changes at each separate component. In a centrifugal flow gas turbine, the direction of air flow changes at each separate component of the engine, such as the inlet, compressor, combustion chamber, and turbine. As the air moves through the compressor, its direction is changed due to the centrifugal force acting on the air. Similarly, the air flow direction changes again as it enters the combustion chamber and the turbine. The other options are incorrect because the air flow direction does not only change once from inlet to outlet (A), it does not only change at the compressor inlet (B), and it does not only change at the compressor discharge (D). The changes in air flow direction occur at each separate component of the centrifugal flow gas turbine.