Discussion
Which device prevents the engine driving the starter motor?
Answer: C
A roller or sprag clutch transmits torque from motor to engine but freewheels the other way. Without it a firing engine would spin the armature to destruction before the driver released the key. The solenoid does release, but not instantly. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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