A 27-year-old white female sees you for the first time for a routine evaluation. A Papanicolaou test reveals atypical glandular cells of undetermined significant (AGUS).

Of the following, which one is most commonly found in this situation?

A. Cervical intraepithelial neoplasia
B. Endometrial hyperplasia
C. An endocervical polyp
D. Endometrial cancer
E. Ectopic decidua