**Core Concept:** Wound healing is a complex process involving various stages, cells, and molecules. Vitamins play a crucial role in maintaining normal wound healing by participating in different stages like inflammation, proliferation, and remodeling. Vitamin deficiencies can lead to impaired wound healing due to reduced collagen synthesis, impaired immune response, and decreased angiogenesis.

**Why the Correct Answer is Right:** Vitamin C, also known as ascorbic acid, is a key antioxidant involved in collagen synthesis, immune response modulation, and fibroblast proliferation. Deficiency of Vitamin C leads to poor wound healing due to reduced synthesis of collagen, impaired wound contraction, and delayed re-epithelialization.

**Why Each Wrong Option is Incorrect:**

A. Vitamin E deficiency: Vitamin E is an antioxidant, but its primary role is in maintaining membrane fluidity and protecting lipids from oxidation. Its deficiency does not directly impair collagen synthesis or wound healing.

B. Vitamin D deficiency: Vitamin D is essential for bone health and calcium absorption, but it does not directly influence collagen synthesis or wound healing.

C. Vitamin K deficiency: Vitamin K is crucial for clotting factors synthesis, but it does not directly affect collagen synthesis or wound healing.

D. Vitamin A deficiency: Vitamin A is essential for maintaining epithelial integrity, visual function, and immune system function, but its deficiency does not directly impair collagen synthesis or wound healing.

**Clinical Pearl:** Poor wound healing due to Vitamin C deficiency is commonly seen in smokers, alcoholics, and malabsorptive states like celiac disease.

In summary, Vitamin C is crucial for wound healing, and its deficiency results in poor wound healing due to reduced collagen synthesis, impaired wound contraction, and delayed re-epithelialization.