Which of the following choices is critical when climbing a ladder?

When climbing a ladder, keeping hands free is crucial because it allows for stability and control while ascending or descending. Maintaining a firm grip on the ladder with both hands ensures that you can balance yourself and react to any shifts in your position or surroundings. This practice minimizes the risk of a fall, which is a significant concern when using ladders.

The other considerations, while important, do not provide the same level of immediate safety during the act of climbing. For instance, wearing gloves can enhance grip but isn’t as critical to maintaining balance as having both hands available on the ladder. Having a partner can be helpful for assistance or safety, but it does not directly contribute to the physical act of climbing. Wearing a hard hat is essential for personal protection from overhead hazards, yet it does not influence the climber's ability to navigate the ladder safely.

Ultimately, having both hands free allows for optimal maneuverability and balance, which is necessary for safe ladder use.