Which of the following is a complication associated with immobility?

The choice regarding elevated calcium levels leading to kidney stones accurately identifies a known complication associated with immobility. When a person remains immobile for an extended period, the body can begin to break down bone tissue to release calcium into the bloodstream. This process can lead to hypercalcemia, where there are elevated levels of calcium in the blood. When the kidneys filter this excess calcium, it can result in the formation of kidney stones, as the kidneys struggle to process the increased calcium levels.

This physiological response highlights the importance of movement and weight-bearing activities for maintaining bone health and regulating calcium levels, thereby preventing such complications. Conversely, the other options imply benefits or improvements in physical conditions that would actually contradict the effects of immobility. Immobility typically results in decreased muscle strength, impaired blood circulation, and reduced joint flexibility, making the identification of the complication linked to hypercalcemia particularly relevant in the context of long-term immobilization.