A 24-year-old G3P2 presents with the chief complaint of some lower abdominal pain accompanied by a..

A 24-year-old G3P2 presents with the chief complaint of some lower abdominal pain accompanied by a small amount of vaginal bleeding. She is 16 weeks’ pregnant and has been healthy throughout the pregnancy. She does not smoke cigarettes, drink alcohol, or use illicit drugs. Abdominal examination is normal. Pelvic examination reveals that the internal cervical os is closed. Which of the following is the most likely diagnosis? a. Complete abortion b. Incomplete abortion c. Threatened abortion d. Inevitable abortion e. Missed abortion