**Core Concept**
Nephrotic syndrome is a clinical disorder characterized by massive proteinuria, hypoalbuminemia, edema, and hyperlipidemia. At the molecular level, the pathogenesis involves alterations in the glomerular filtration barrier, leading to excessive permeability and loss of proteins, particularly albumin.

**Why the Correct Answer is Right**
The correct answer involves the activation of the alternative complement pathway, which plays a crucial role in the immune complex-mediated injury to the glomerular basement membrane. This leads to the activation of complement components, such as C3 and C5, resulting in the formation of the membrane attack complex (MAC) and the release of pro-inflammatory mediators. The alternative pathway is particularly relevant in the context of nephrotic syndrome, as it is activated in response to immune complexes and contributes to the disruption of the glomerular filtration barrier.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a condition characterized by acute kidney injury, which is not directly related to the pathogenesis of nephrotic syndrome.

**Option B:** This option is incorrect because it refers to a condition characterized by inflammation of the glomeruli, which is not the primary mechanism underlying nephrotic syndrome.

**Option C:** This option is incorrect because it refers to a condition characterized by the deposition of immune complexes in the glomeruli, which is not the primary mechanism underlying nephrotic syndrome.

**Clinical Pearl / High-Yield Fact**
The nephrotic syndrome is characterized by the loss of albumin and other proteins in the urine, leading to hypoalbuminemia and edema. The key to diagnosis lies in the identification of massive proteinuria (>3.5 g/24 hours) and hypoalbuminemia (<3 g/dL). **Correct Answer: C. Activation of the alternative complement pathway.**