Which combination reflects the correct types of crane accidents involving tipovers and electric lines?

The correct answer indicates that the types of crane accidents involving tipovers and electric lines are fundamentally linked to the scenarios presented in options II and III.

When considering crane safety, tipovers often happen when a crane's center of gravity shifts too far outside its base, particularly when operating on unstable ground or when improperly loaded. This situation intensifies in proximity to electric lines, as the added risk from electrical hazards can lead to further complications and increase the likelihood of an accident.

In addition to tipovers, electric lines present a significant hazard when cranes are in operation nearby. If a crane contacts an electric line, it can result in catastrophic accidents involving electrocution or fires. Thus, the correct pair captures the essence of these risks and how they interplay during crane operations.

In contrast, if the other combinations included scenarios that did not directly relate to either tipovers or electric line hazards, they would not adequately reflect the specific types of crane accidents being addressed in this context. Therefore, the selection of II and III demonstrates a thorough understanding of the critical safety aspects involving crane operations in relation to both stability and electrical safety.