A 78-year-old patient has a history of osteoarthritis and lives alone in a two-story home. The bathroom is on the first level and the bedroom is on the second level. The patient states, "I am so upset. I have been wetting the bed at night because I can't get down the stairs in time." What type of incontinence does the patient most likely have?

A. Functional: Functional incontinence occurs when a person is continent but unable to reach the bathroom in time due to physical or environmental barriers. In this case, osteoarthritis and stairs limit timely access. B. Stress: Stress incontinence is the involuntary loss of urine during activities that increase abdominal pressure (e.g., coughing, sneezing). Not described here. C. Mixed: Mixed incontinence involves symptoms of both stress and urge incontinence. No symptoms of urgency or leakage on exertion are reported. D. Urge: Urge incontinence involves a sudden, intense urge to urinate followed by involuntary leakage. The patient’s issue is mobility, not urgency.