A 9-year-old boy is brought with history of decreased urine output, cola colored urine and swelling of the face & hands of 2 days duration. He is hypeensive, has a puffy face and pitting edema of the lower limbs. He has history of skin lesions 4 weeks earlier. A diagnosis of post streptococcal glomerulonephritis is made. C3 levels are likely to return to normal in?
2 weeks 4 weeks 8 weeks 6 weeks