Situation C best represents causation as increasing bulb wattage results in increased light emission.
Causation is best represented by situation C, where increasing the wattage of bulbs directly leads to an increase in the amount of light emitted. This demonstrates a clear cause-and-effect relationship.
Situations A, B, and D do not establish direct causation as in situation C. They either imply correlations, indirect influences, or unrelated factors.
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