Lymph tissue and lymph nodes that protect the body from infection A. adenoids and tonsils
B. alveoli and sinuses
C. bronchi and trachea

Its A. The adenoids and Tonsils. Adenoids are a patch of tissue thats high in the throat, directly behind the nose. They, along with the tonsils, are parts of the lymphatic system. In simple terms it helps stop infection and keep many body fluids in balance. They basically trap the germs that make their way through the mouth and nose. To add on, when the tonsils become inflamed either by taking too much germs or bacteria, thats what tonsillitis is. Hope this helps

What are the choices?