Discussion
Which fault does a reading of 12.6 volts with the engine running indicate?
Answer: C
Battery voltage with no rise means no contribution from the alternator whatever. A slipping belt genuinely produces a low reading under load, which makes the last option a real cause worth excluding before condemning the machine. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking which component actually carries the load settles most questions of this kind at once. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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