Which of the following reflects an individual risk related to a user's mobility?

The choice that reflects an individual risk related to a user's mobility is the one that highlights the increased risk of falling without a walker. This statement directly addresses a specific mobility-related concern. Walkers are often prescribed to assist individuals with balance and support when walking, particularly for those who may have weaknesses, instability, or other mobility limitations. Without the use of a walker, the chance of falls increases significantly, which can lead to serious injuries such as fractures or head trauma.

The other scenarios mentioned, while they may present risks to an individual, do not specifically relate to mobility. The risk of being hit by a baseball connects more to environmental hazards and safety in active situations, while the high risk due to being deaf addresses communication and sensory impairment rather than mobility itself. Therefore, focusing on the direct relationship to mobility, the answer about the walker accurately reflects the unique risks associated with an individual's capacity to move safely.