The correct answer is Vitamin K. Vitamin K is a fat-soluble vitamin that is essential for blood clotting. It is also involved in bone metabolism and the production of proteins that are necessary for blood clotting. Vitamin K is found in green leafy vegetables, broccoli, Brussels sprouts, cabbage, and liver. It can also be taken as a supplement.
Vitamin A is a fat-soluble vitamin that is essential for vision, skin, and immune function. It is not involved in blood clotting.
Vitamin C is a water-soluble vitamin that is essential for the formation of collagen, a protein that is found in skin, bones, and connective tissue. It is also involved in the absorption of iron and the production of white blood cells. Vitamin C is not involved in blood clotting.
Vitamin D is a fat-soluble vitamin that is essential for bone health. It is also involved in the absorption of calcium and phosphorus. Vitamin D is not involved in blood clotting.