Question: In the context of differences - in - differences analysis, what does the parallel trends assumption refer to ? The treatment and control groups have

In the context of differences-in-differences analysis, what does the parallel trends assumption refer to?
The treatment and control groups have the same level of performance before the intervention
The treatment and control groups are exposed to the same external factors over time
The treatment and control groups would have experienced the same changes in outcomes in the absence of the intervention
The treatment and control groups have similar characteristics and demographics

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