A) A 16-year-old woman, 24 weeks pregnant, with painless contractions
B) A 21-year-old woman, 6 weeks pregnant, passing vaginal blood clots
C) A 32-year-old woman, in the third trimester, passing foul-smelling and bloody vaginal discharge
D) A 38-year-old woman, 36 weeks pregnant, having abdominal pain with painless vaginal bleeding