When the nurse is obtaining health history during an annual physical examination, the client reports having difficulty with erections for the past 8 months. Which information in the client's history should the nurse consider as a potential reason for erectile dysfunction?

A. A lifestyle with minimal physical activity may contribute to general health issues, but it is not as directly linked to erectile dysfunction as conditions like diabetes. B. Working long hours can cause stress or fatigue, which may indirectly affect sexual function, but it is not a direct cause of erectile dysfunction. C. Type 2 diabetes mellitus is a well-known risk factor for erectile dysfunction due to its impact on blood flow and nerve function, both of which are essential for normal erectile function. D. A phosphodiesterase inhibitor is often used to treat erectile dysfunction, but its presence on the medication list is more likely a treatment rather than a cause.