Final answer:
The trachea is not reinforced with D-shaped cartilages, but with C-shaped cartilages stacked together, which provide structural support and prevent the trachea from collapsing. The false statement about the trachea is option (b).
Step-by-step explanation:
The false statement about the trachea is option (b), which states that the trachea is reinforced with D-shaped cartilages. In reality, the trachea is reinforced with C-shaped cartilages that are stacked together. These cartilages provide structural support to the trachea, preventing it from collapsing during inhalation and exhalation.