Allergic rhinitis is characterized by:

A. Tertiary prevention involves managing and mitigating the effects of an established disease or condition, which does not apply here.

B. Secondary prevention focuses on early detection and treatment of diseases, but wearing a helmet is about preventing injury rather than detecting it.

C. None of these would imply that there is no relevant level of prevention being demonstrated, which is incorrect.

D. Primary prevention aims to prevent the onset of disease or injury, and wearing a helmet while biking is a proactive measure to prevent head injuries.

A. Oral edema and vomiting are not typical signs of allergic rhinitis; these symptoms are more associated with systemic allergic reactions or anaphylaxis.

B. Laryngeal edema may occur in severe allergic reactions but is not characteristic of allergic rhinitis specifically.

C. Urticaria refers to hives and is another form of allergic response but does not describe the nasal symptoms typical of allergic rhinitis.

D. Swelling and itching of the nasal passages are hallmark symptoms of allergic rhinitis due to inflammation from allergen exposure.