The PMHNP is asked to evaluate a 21-year-old woman with a tear of her anterior cruciate ligament (ACL). The orthopedic surgeon who requested the evaluation says the patient has been in the hospital for 2 days and is scheduled for surgery tomorrow. The patient complains of anxiety about her upcoming surgery. She is afebrile, her heart rate is 95, and her blood pressure is 110/76. She is not currently in pain; her knee pain is controlled by acetaminophen. Which of the following is the most appropriate medication for this patient based on this scenario?