What should the vehicle owner be informed about in writing regarding their vehicle's safety?

The correct choice highlights the responsibility of the mechanic to inform the vehicle owner about any components that may pose an increased risk to safety in the near future. This proactive communication ensures that vehicle owners are aware of potential dangers that could arise before the next scheduled inspection, allowing them to take appropriate action to address those issues.

By informing the owner about parts that could become more dangerous, it encourages timely repairs and maintenance, thereby promoting overall vehicle safety. This approach aligns with the larger goal of inspection programs, which is to identify and mitigate risks that could lead to accidents or breakdowns.

The other choices do not focus on the safety risks that may develop over time. For example, informing owners about parts that may become safer or have recently been repaired does not serve the immediate need to prevent future hazards. Similarly, simply discussing parts that are not working may overlook the importance of preventative measures against parts that could deteriorate further.