The correct answer is C) Pressure ratio, air flow, rotational speed. The performance of a gas turbine compressor is primarily affected by three key factors: pressure ratio, air flow, and rotational speed. The pressure ratio across the compressor, the mass flow rate of air through the compressor, and the rotational speed of the compressor are the principal parameters that determine the compressor's efficiency and overall performance. Changes in these factors can significantly impact the compressor's ability to deliver the required airflow and pressure to the combustion section of the gas turbine engine. The other answer choices, while related to gas turbine performance, do not directly address the key factors affecting the compressor itself. Bleed pressure, fuel pressure, and exhaust temperature are more relevant to other sections of the gas turbine system, not the compressor specifically.