A series of C shaped cartilage rings are found in the wall of:

Explanation

The correct answer is Option B: Trachea. The trachea is supported by C-shaped cartilaginous rings that prevent its collapse and allow it to remain open for air passage. These C-shaped rings are open at the back to allow expansion of the esophagus during swallowing, as the trachea and esophagus are adjacent to each other.Option A is incorrect because the epiglottis is not a structure with C-shaped rings; it is a flap that prevents food from entering the trachea during swallowing.Option C is incorrect because the bronchi have plates of cartilage, which differ from the C-shaped rings found in the trachea.Option D is incorrect since C-shaped cartilage rings are indeed present in one of the structures mentioned, specifically the trachea.