Labor Complications — MCQs

A 60-year-old, multiparous, woman comes to the physician because of urinary leakage for the past 4 months. She involuntarily loses a small amount of urine after experiencing a sudden, painful sensation in the bladder. She wakes up at night several times to urinate, and she sometimes cannot make it to the bathroom in time. She has diabetes mellitus type 2 controlled with insulin and a history of pelvic organ prolapse, for which she underwent surgical treatment 5 years ago. Menopause was 11 years ago. She drinks 4-5 cups of coffee daily. Pelvic examination shows no abnormalities, and a Q-tip test is negative. Ultrasound of the bladder shows a normal postvoid residual urine. Which of the following is the underlying cause of this patient's urinary incontinence?