Which of the following is essential for ladder stability?

The essential factor for ladder stability is securing the base on firm ground. When a ladder is placed on a stable and level surface, it minimizes the risk of slipping or tipping over. This stability is crucial when climbing, as even slight movements can cause an unstable ladder to become dangerous. A firm base supports the ladder’s weight and allows it to effectively distribute the load.

In contrast, placing a ladder on uneven surfaces significantly increases the risk of accidents. Utilizing only one hand while climbing can compromise balance and stability, as climbers may not be able to maintain a secure grip. Ignoring the ladder's condition can lead to using equipment that is damaged or worn, which can fail under the weight and compromise stability. Thus, securing the base on firm ground is fundamentally important for safe ladder use.