Which information is most important for the nurse to obtain when determining a client's risk for obstructive sleep apnea syndrome (OSAS)?

A. Level of consciousness is not directly related to the risk of OSAS. B. Body mass index (BMI) is a significant risk factor for OSAS, as higher BMI is strongly associated with increased risk of sleep apnea. C. Self-description of pain does not relate to the risk factors for OSAS. D. Breath sounds might be relevant in assessing respiratory status but do not directly indicate the risk for OSAS.