**Core Concept**
The girl's symptoms, including generalized swelling, proteinuria, and the presence of hyaline and fatty casts in the urine, are indicative of nephrotic syndrome. This condition is characterized by heavy proteinuria, hypoalbuminemia, and edema.

**Why the Correct Answer is Right**
The correct answer suggests that the renal biopsy will not show IgG deposits or C3 deposition, which is consistent with minimal change disease (MCD), the most common cause of nephrotic syndrome in children. MCD is characterized by the loss of foot processes of podocytes and normal glomerular morphology on light microscopy, but the absence of immune deposits on electron microscopy. This condition typically responds well to corticosteroid therapy.

**Why Each Wrong Option is Incorrect**
**Option B:** The C3 levels will be normal in MCD, as it is not an immune complex-mediated disease. Low C3 levels are typically seen in post-streptococcal glomerulonephritis (PSGN) or other immune complex-mediated glomerulonephritides.

**Option C:** IgA nephropathy is a common cause of hematuria, particularly after an upper respiratory tract infection, and is not typically associated with nephrotic syndrome. This condition is characterized by the deposition of IgA antibodies in the glomeruli.

**Option D:** Alport's syndrome is a genetic disorder characterized by hematuria, proteinuria, and renal failure, often associated with hearing loss and eye abnormalities. It is not typically associated with nephrotic syndrome in children.

**Clinical Pearl / High-Yield Fact**
Minimal change disease is often referred to as the "salt-wasting" nephrotic syndrome due to the loss of sodium and water in the urine, leading to hypovolemia and hyperreninemia.

**✓ Correct Answer: A. No IgG deposits or C3 deposition on Renal biopsy**