The effectiveness of an off-line wash wash of a LM2500 gas turbine engine can be enhanced by doing which of the following?

Correct Answer: Option A — Stroking the Variable Stator Vanes to the maximum open position.

Stroking the Variable Stator Vanes (VSV) to the maximum open position during an off-line wash ensures that cleaning solution reaches all internal compressor stages and surfaces. This maximizes the removal of salt and particulate deposits, restoring compressor efficiency and maintaining the engine's performance within the manufacturer's specified operating parameters.