As Airways Become Smaller,________

As airways become smaller,________.

A) the amount of cartilage decreases, the amount of smooth muscle increases, and the type of epithelium does not change
B) the amount of cartilage increases, the amount of smooth muscle decreases, and the type of epithelium changes
C) the amount of cartilage decreases, the amount of smooth muscle increases, and the type of epithelium changes
D) the amount of cartilage increases, the amount of smooth muscle increases, and the type of epithelium changes