A nurse is providing teaching to an older adult client about factors that increase the risk of urinary tract infection. Which of the following information should the nurse include?

The correct answer is C: Decreased bladder tone can cause urinary retention. In older adults, decreased bladder tone can lead to incomplete emptying of the bladder, increasing the risk of urinary tract infection. Bladder capacity decreasing (A) is a normal part of aging but does not directly increase the risk of UTI. The urethral sphincter functioning less efficiently (B) may contribute to urinary incontinence but not directly to UTI. The ability to concentrate urine decreasing (D) is a normal part of aging but does not directly impact UTI risk.