When people's symptoms of psychological distress are at their worst, whatever they do to try to alleviate the condition is likely to be followed by improvement rather than further deterioration. This is best explained in terms of

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This phenomenon is called regression toward the mean, which is a statistical phenomenon where extreme scores on a measure tend to move closer to the average score when the measurement is repeated. Therefore, when people's symptoms are at their worst, they are likely to improve regardless of the intervention due to this statistical effect. A, B, and C are not relevant to explaining this phenomenon.

When People's Symptoms of Psychological Distress Are at Their Worst