The correct answer is A) Prevent disengagement of parts. Safety-wiring or lock wiring of gas turbine parts is required to prevent the disengagement of critical components. This is a safety-critical measure to ensure that parts do not come loose during operation, which could lead to catastrophic failure of the gas turbine engine. The wiring securely locks the parts in place, preventing them from vibrating or working themselves loose over time. The other options are incorrect because they do not directly address the primary purpose of safety-wiring, which is to maintain the structural integrity and safe operation of the gas turbine system.