What is a primary reason extension cords can be dangerous?

The selection highlights a significant safety concern regarding extension cords: the risk of tripping hazards. When extension cords are not carefully managed, they can cross walkways or be left in areas where people may not see them, creating a potential for trips and falls. This is particularly critical in environments where there may be various foot traffic, such as construction sites or during large events. Injury from tripping can lead to serious accidents, especially in scenarios where heavy tools or equipment are involved.

While the other options touch on some level of concern, they don't address the direct and immediate dangers associated with improper cord management and the consequent potential for physical injuries. Therefore, recognizing the tripping hazard as a primary reason underscores the necessity for electricians to maintain awareness of their work environment and ensure that any cords used are organized and positioned safely.