Which factors are associated with placenta previa?

The correct response highlights the connection between a history of previous cesarean sections, uterine curettage, and anemia with the occurrence of placenta previa.

Previous cesarean sections are significant risk factors because they can lead to scarring or changes in the uterine lining, potentially affecting the implantation site of the placenta. The presence of uterine scars from these surgeries can predispose women to placenta previa, where the placenta implants low in the uterus, sometimes covering the cervix.

Uterine curettage, a procedure often performed to remove tissue from the uterus, can also lead to changes in the uterine environment. Similar to cesarean sections, it can alter the endometrial lining, making it more likely for the placenta to implant in an abnormal location.

Anemia does not directly cause placenta previa but can often be associated with other underlying conditions or complications in pregnancy that may contribute to it. Women with anemia may have had previous surgeries or complications that influence risk factors for placenta previa.

While the other answer choices mention factors that are often linked with placenta previa, they do not encompass the range and clinical relevance of the factors outlined in the correct response.