A 35-year-old woman delivers her baby at 40 weeks gestation without complication. Seven days later she experiences an acute onset of pancephalic headache, behavioral and personality changes, irritability, intermittent seizures, and diplopia. The most likely diagnosis of her problem is:
A. Aseptic meningitis
B. Cerebral venous thrombosis
C. Complicated migraine
D. Bacterial meningoencephalitis
E. Pseudotumor cerebri