Question EASA Drone License A2 - Flight performance and planning

211 - EASA Drone A2 License - If you are flying high in the mountains, what effect might the high altitude have on the remote pilot's human performance?

It drastically improves visual acuity

Lower oxygen levels (mild hypoxia) can cause fatigue, slower reaction times, and impaired decision-making

It makes the pilot immune to motion sickness

It has no physiological effect unless the pilot is flying above 10,000 metres