The correct answer is The rolling average remains close to the mean line.

A rolling average that stays near the mean line indicates the process is stable and that variation is common cause rather than special cause. This pattern shows the team is delivering at a consistent rate across iterations and there are no persistent trends or sudden shifts in performance.

Several data points fall well outside the control limits is incorrect because points outside control limits indicate special cause variation and instability. Those signals suggest the process is not steady and that an investigation is needed to identify and correct unusual events.

The rolling average trends downward across multiple iterations is incorrect because a downward trend shows declining productivity rather than steady performance. A steady team would show no long directional trends in the rolling average.

A histogram shows a narrow spread of cycle times is incorrect because a histogram captures the distribution of past data but it does not show stability over time. A narrow spread can indicate low variability but it does not prove the process is stable unless the time series shows no trends or special cause signals.

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