A 19-Year-Old Woman Comes to the Gynecologist's Office

A 19-year-old woman comes to the gynecologist's office. When the nurse asks the reason for this visit, the woman explains that she has never had a menstrual period, and that she is concerned there might be something wrong. The diagnosis that the physician is most likely to make based on this information is:

A) Primary dysmennorrhea.
B) Secondary infertility.
C) Primary amenorrhea.
D) Secondary amenorrhea.