Which of the following obstetric conditions carries the highest risk for postpartum hemorrhage (PPH)?

Correct option is B

Multiple gestation (twins) causes overdistension of uterus → atonic PPH risk is highest compared to other listed conditions.
Explanation of options: (a) ✘ Breech can cause trauma but not highest PPH risk. (b) ✔ Correct; twin pregnancy = uterine overdistension = atonic PPH. (c) ✘ Anemia worsens outcome but doesn’t directly cause PPH. (d) ✘ Polyhydramnios also causes overdistension, but twins carry more risk.