First pregnant woman, 25 years old.  At 32 weeks of pregnancy, she came to the doctor because of body edema and headache. She had facial and lower extremity edema before pregnancy. Blood pressure was 160/110mmHg (11.3/14.7kPa), urine protein (+++), granular casts and red blood cells were seen.  After treatment, she gave birth naturally at 37 weeks of gestation. At 6 weeks postpartum, her blood pressure dropped to 128/75mmHg (17/10kPa), urine protein (++), and edema (+).  Which of the following diagnoses is more likely
A、Preeclampsia
B、Pregnancy with nephritis
C、Chronic nephritis complicated by preeclampsia
D、Pregnancy with chronic hypertension
E、Essential hypertension complicated by preeclampsia