A 28yo woman has delivered with rotational forceps after an 8h labor and 3h second stage

A 28yo woman has delivered with rotational forceps after an 8h labor and 3h second stage.
Choose the single most likely predisposing factor for PPH for this pt?
a. Atonic uterus
b. Cervical/vaginal trauma
c. Retained product
d. Preterm labor
e. Uterine infection
Ans. The key is B. Cervical/vaginal trauma. [complication of forceps delivery].