Step 1: Understanding the Concept:
This question tests knowledge of vitamins and their functions in the human body.
Step 2: Detailed Explanation:
Vitamin K is essential for blood clotting (coagulation).
It is required for the synthesis of prothrombin and other clotting factors.
Deficiency leads to:
- Excessive bleeding
- Easy bruising
- Prolonged clotting time
- Hemorrhagic disease in newborns
Other vitamins:
- Vitamin A: Vision, immune function, epithelial health.
- Vitamin C: Collagen synthesis, antioxidant, wound healing.
- Vitamin D: Calcium absorption, bone health.
Thus, "clotting of blood" is directly related to Vitamin K deficiency.
Step 3: Final Answer:
Thus, the correct answer is Vitamin K, which corresponds to option (A).
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