Office X recently implemented a new data processing system. Since the implementation, quality analysts have noticed significantly fewer errors in data processing. The analysts conclude the new data processing system is the cause of the higher$-$quality data processing.

Which of the following statements, if true, would most strengthen the above conclusion?

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On average, data processing in the office now takes longer to complete.

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A neighboring office has expressed interest in using the same system that Office X just implemented.

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Data processors in Office X recently completed training on how to use the new system.

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When processing a test batch of data, analysts found fewer errors in the data processed by the new system than the old system.

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A survey found data processors think the new system is extremely user$-$friendly.