The nurse is reviewing the preoperative assessment forms for four clients scheduled for surgery this morning. Based on the data below, which client is at the highest risk for postoperative complications?

A 25-year-old client having an elective knee arthroscopy with no medical history

A 68-year-old client with type 2 diabetes and chronic obstructive pulmonary disease (COPD) scheduled for bowel resection

A 45-year-old client with controlled hypertension scheduled for gallbladder removal

A 58-year-old client with mild osteoarthritis scheduled for cataract surgery