Which of the following factors may contribute to poor pilot performance related to alcohol?

The correct choice encompasses multiple factors that can lead to degraded pilot performance due to alcohol consumption.

Blood alcohol concentration at or above 0.04g/dL is critical because it is the legal limit for pilots in many jurisdictions, where operational performance can significantly decline. This level of alcohol impairs cognitive and motor skills, making it difficult to handle aircraft effectively.

Inexperience in flying conditions can also be a factor, as new pilots may already be struggling with unfamiliar environments or challenging situations. When combined with alcohol consumption, which impairs judgment and reaction times, this can exacerbate the risks involved in flying.

A recent hangover from prior alcohol consumption can further impact pilot performance. Hangover symptoms, such as fatigue, headache, and decreased concentration, may linger even after the alcohol has cleared from the system, compromising the pilot's ability to operate the helicopter safely.

Combining these factors means that the overall risk increases significantly, making “all of the above” the most comprehensive answer regarding elements contributing to poor pilot performance related to alcohol. Each aspect independently affects a pilot's performance, thereby supporting the rationale for the selected response.