Problem: Steve is a 28-year-old triathlete who constantly consumes a healthy diet. He refuses to eat anything that he deems "unhealthy." He will rarely eat out with friends and even refused to eat a meal that his grandmother cooked for his birthday. He is extremely calorie and nutrient conscious. Which condition might you suspect? A. Subthreshold anorexia nervosa B. Orthorexia nervosa C. Restrictive nutrition syndrome D. Avoidant nutrition syndrome