题目选项分析

Psychologist: In a survey, several hundred volunteers rated their own levels of self-control and their overall life satisfaction. The volunteers who rated themselves as having better self- control also reported greater satisfaction with their lives. This suggests that self-control is one factor that helps people avoid situations likely to produce dissatisfaction.

In order to assess the strength of the psychologist's argument, it would be most helpful to know whether

【选项】people's perceptions of how satisfied they are with their lives could be affected by factors of which they are unaware