A. "Placenta previa usually results in a higher risk of maternal hypertension, while abruptio placentae is commonly associated with a low-risk pregnancy. This is incorrect because abruptio placentae, not placenta previa, is associated with maternal hypertension (e.g., preeclampsia, chronic hypertension). Placenta previa is not related to blood pressure issues. B. "Placenta previa is characterized by sudden onset of severe abdominal pain and uterine tenderness, while abruptio placentae is associated with painless bleeding." This is incorrect because placenta previa presents with painless, bright red vaginal bleeding, while abruptio placentae causes sudden, severe abdominal pain, uterine tenderness, and possibly dark red bleeding. C. "Placenta previa typically presents with severe pain and contractions, whereas abruptio placentae involves painless bleeding without contractions." This is incorrect because placenta previa does not cause pain or contractions. In contrast, abruptio placentae often presents with painful contractions and uterine hypertonicity. D. "Placenta previa involves the placenta partially or completely covering the cervix, whereas abruptio placentae involves the premature separation of the placenta from the uterine wall." Placenta previa occurs when the placenta covers the cervix (partial or complete), leading to bleeding. Abruptio placentae occurs when the placenta prematurely separates from the uterine wall, which can lead to hemorrhage and fetal distress.