Which statement most accurately describes Nephritic syndrome?

A. A multisystem autoimmune disease associated with diverse autoantibodies and organ involvement. B. A macrocytic anaemia caused by impaired DNA synthesis, often from folate or vitamin B12 deficiency. C. Hyperglycaemia with ketonaemia and metabolic acidosis due to severe insulin deficiency. D. Glomerular inflammation causing haematuria, reduced filtration and often hypertension.