What can increase the risk of a motorcycle fall while driving through road bends?

The selected combination is correct because both an oil spill on the carriageway and a bump on the carriageway can significantly increase the risk of a motorcycle fall while navigating bends. Oil spills reduce traction, making it more difficult for motorcycles to maintain control. Bumps can cause abrupt changes in the motorcycle's stability and trajectory, leading to a loss of balance.

According to German traffic regulations, road safety is paramount, and drivers must be aware of potential hazards on the road. Understanding these risks is critical for motorcyclists, especially when approaching bends where control is most imperative. The combination highlights the importance of recognizing all potential dangers to ensure safer riding practices.