The problem of selective attrition is most likely to arise during

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Selective attrition refers to the tendency of certain individuals who participate in a study to drop out over time, resulting in a biased sample that no longer represents the population of interest. This is more likely to happen in long-term studies, as participants may become disinterested or face logistical barriers that prevent them from continuing to participate. Experiments with random assignment attempt to minimize the effects of selection bias, while brief studies and animal studies are less likely to be impacted by selective attrition due to their shorter duration and lack of human participants.

The Problem of Selective Attrition Is Most Likely to Arise