A 32-year-old woman with known systemic lupus erythematosus develops rising creatinine, proteinuria 2.5 g/day, and urinary red cell casts. Blood pressure is 148/92 mmHg. Which is the most appropriate next step?AStart low-dose prednisone and continue hydroxychloroquine onlyBRefer urgently to nephrology for kidney biopsy and immunosuppressive therapyCStart NSAIDs for symptomatic reliefDStop hydroxychloroquineEReassure and repeat urinalysis in one yearCheck my answer