The epithelium of the pharynx changes from ___ in the nasopharynx to ___ in the oropharynx because ______.
1) pseudostratified ciliated columnar; stratified squamous; the oropharynx is subject to abrasion
2) simple cuboidal; pseudostratified ciliated columnar; gas exchange occurs in the nasal cavity
3) stratified squamous; pseudostratified ciliated columnar; the nasopharynx contains goblet cells
4) none of the above