What is the result of an error in preparing a commercial control?

The result of an error in preparing a commercial control leads to inaccuracies in the control's performance, meaning that its ability to accurately represent true values is compromised. Therefore, the correct interpretation of the consequences of such an error aligns with the option indicating that the results become inaccurate.

A commercial control must be prepared under stringent conditions to ensure that it provides reliable data for quality control in a laboratory setting. If there is an error during its preparation, it fails to maintain the necessary standards expected of a control, leading to misleading results which can affect diagnostic tests and laboratory evaluations.

In the context of laboratory practices where precision and accuracy are critical, an inaccurate control cannot reliably serve its intended purpose, which is to validate the performance of testing equipment and procedures. Thus, the notion that the control is "not affected" is fundamentally flawed, as any deviation in preparation directly impacts its validity and reliability in quality assurance.