The correct answer is C) The igniters will de-energize when the gas generator exceeds a preset RPM. This is correct because in a gas turbine engine, the igniters are used to initiate combustion during engine start-up. Once the gas generator reaches a preset RPM, the igniters are automatically de-energized as the engine is able to sustain combustion without them. The other options are incorrect because A) the igniters are not controlled by exhaust gas temperature, B) the igniters are not controlled by the power turbine RPM, and D) the igniters do not remain energized throughout normal engine operation.