The correct answer is A. Vitamin C.
Vitamin C is a water-soluble vitamin, while vitamins A, D, and K are fat-soluble vitamins.
Vitamin C is a water-soluble vitamin that is essential for the growth and repair of tissues throughout the body. It is also involved in the production of collagen, a protein that is found in skin, bones, and connective tissue. Vitamin C is also a powerful antioxidant that can help protect cells from damage.
Vitamin A is a fat-soluble vitamin that is essential for vision, skin, and immune function. It is also involved in the growth and development of bones and teeth. Vitamin A can be found in animal products such as liver, eggs, and milk, as well as in plant-based foods such as carrots, sweet potatoes, and dark leafy greens.
Vitamin D is a fat-soluble vitamin that is essential for bone health. It is also involved in the regulation of blood calcium levels and immune function. Vitamin D can be obtained from sunlight exposure, as well as from food sources such as fatty fish, egg yolks, and fortified milk.
Vitamin K is a fat-soluble vitamin that is essential for blood clotting and bone health. It is also involved in the regulation of blood calcium levels. Vitamin K can be obtained from food sources such as green leafy vegetables, broccoli, and Brussels sprouts, as well as from supplements.