A 32-year-old G2P1 woman at 38 weeks gestation presents with sudden onset painless vaginal bleeding. She denies abdominal pain or contractions. Fetal heart rate monitoring is reassuring, and the uterus is soft and non-tender on palpation. Her previous pregnancy was uncomplicated. What is the most likely cause of her bleeding?
✓ Correct Answer: Option A
Painless vaginal bleeding in the third trimester is the classic presentation of placenta previa, where the placenta covers the internal cervical os. Placental abruption typically causes painful bleeding and uterine tenderness.