Keith Williams
In reply to the answer I can see your dilema unfolding to a very complex question.
My reasoning for selecting 'd' was in regard to the B737 (which has an indirectly powered controlled aileron system,that is yoke movement,captains to primary flight control,co-pilot to secondry,with-out bringing in loss motion devices for possible failure of either,then into a mixer box from either,onto hydraulic input selectors to the aileron output quadrants wich feed cable movement to a servo tab on the aileron.
In this circumstance would you consider it a powered flight control ??
Cheers