An axial compressor stator vane that is mechanically adjusted to provide optimum compressor performance over a wide operating range is referred to as which of the following?

Correct Answer: Option C — Variable Stator Vane (VSV)

Variable Stator Vanes (VSVs) are mechanically actuated components that adjust the angle of attack of the air entering the compressor stages. This capability allows the gas turbine to maintain high efficiency and stability across varying load and speed requirements.