A 37-year-old woman who gave birth to twins 24 hours ago suddenly develops blurred vision, severe headaches, and upper abdominal pain under the ribs on her right side. Her last blood pressure reading was 146/92 mm Hg. Which of the following is the most appropriate treatment?

Choice A reason: Low-dose aspirin is used for preeclampsia prevention during pregnancy, not for acute postpartum hypertension with severe symptoms. Choice B reason: Magnesium sulfate is the treatment of choice for preventing seizures in postpartum preeclampsia or eclampsia and managing severe symptoms such as headaches, blurred vision, and upper abdominal pain. Choice C reason: Lorazepam is an anxiolytic and anticonvulsant but is not first-line therapy for preeclampsia or eclampsia. Choice D reason: Lactated Ringer's solution is a supportive fluid but does not address the underlying risk of seizures or severe hypertension.