Tocometry reveals a quiescent uterus; fetal heart tones are in the 150s and reactive

Mrs Clark, a 27 yo G1P0 presents to you at 29 weeks’ gestation with bright red vaginal bleeding which began 2 hours ago. Tocometry reveals a quiescent uterus; fetal heart tones are in the 150s and reactive.

What is the most likely diagnosis?

A. Inevitable abortion
B. Placenta previa
C. Abruptio placentae
D. Ectopic pregnancy