Discussion
Which construction reduces the size and weight of a modern starter?
Answer: C
Permanent magnets replace the field coils and a reduction gear lets a small fast motor produce the torque needed. The result is around half the weight of an older starter. Higher voltage genuinely is used on commercial vehicles for the same reason. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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