Which of the following increases the risk of errors for pilots?

High levels of fatigue significantly increase the risk of errors for pilots due to its profound impact on cognitive function and decision-making abilities. Fatigue can lead to diminished alertness, reduced concentration, slower reaction times, and impaired judgment. When pilots are fatigued, they may struggle to process information effectively and are more likely to overlook critical details, which can result in safety risks during flight operations.

In contrast, proper management of resources, optimal team communication, and regular physical fitness training contribute positively to a pilot's performance and can help mitigate errors. Proper resource management ensures that pilots utilize available tools and support systems effectively, while optimal team communication enhances collaboration and situational awareness among crew members. Regular physical fitness training promotes overall health and stamina, helping pilots maintain their performance levels in demanding situations.