A Woman Takes a Pregnancy Test the First Day After

A woman takes a pregnancy test the first day after a missed period and it comes out positive; however, she begins to menstruate two weeks later. The most likely explanation is that

A) the woman took the test too early in her pregnancy, making the results unreliable.
B) an embryo implanted briefly but died shortly thereafter.
C) the false positive was due to endometriosis rather than pregnancy.
D) the woman took the test too late in her pregnancy, making the results unreliable.
E) taking the pregnancy test caused her to miscarry and lose the pregnancy.