A child presents with stridor, barking cough and difficulty in breathing since 2-3 days.He has fever and elevated leukocyte count.All of the following statements about his condition are true,Except

• A. Symptoms are predominantly caused by involvement of the subglottis
• B. Antibiotics form the mainstay of treatment.
• C. Subglottis stenosis and hypopharyngeal dilatation may be seen on X-rays
• D. Boys are more commonly affected than girls