**Core Concept**
The hyperacute rejection of a renal transplant occurs due to an immediate immune response against the transplanted kidney, primarily mediated by pre-existing antibodies against human leukocyte antigens (HLA) and other non-HLA antigens present on the graft. This reaction is a classic example of a type II hypersensitivity reaction.

**Why the Correct Answer is Right**
The correct answer is based on the pathophysiology of hyperacute rejection, which involves the activation of complement and the subsequent lysis of endothelial cells lining the graft's blood vessels. This leads to thrombosis, ischemia, and necrosis of the graft, resulting in rapid failure of the transplanted kidney. The pre-existing antibodies against HLA and non-HLA antigens on the graft trigger this reaction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a type I hypersensitivity reaction, which is mediated by IgE antibodies and mast cells, and is not relevant to the hyperacute rejection of a renal transplant.

**Option B:** This option is incorrect because it refers to a type III hypersensitivity reaction, which is mediated by immune complexes and is not the primary mechanism involved in hyperacute rejection.

**Option C:** This option is incorrect because it refers to a type IV hypersensitivity reaction, which is mediated by T cells and is typically seen in delayed hypersensitivity reactions, such as contact dermatitis.

**Clinical Pearl / High-Yield Fact**
It is essential for transplant surgeons and nephrologists to perform thorough cross-matching between the donor and recipient to identify any pre-existing antibodies that could trigger hyperacute rejection.

**Correct Answer:** C. Type II hypersensitivity reaction