The correct answer is option 3 - Vitamin C. Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that is found in citrus fruits like lemons. It is an essential nutrient required by the body for the growth and repair of tissues. Vitamin C is known for its antioxidant properties, which help protect the body against harmful free radicals. It is also important for the production of collagen, a protein that supports the structure of skin, cartilage, and blood vessels. Additionally, Vitamin C plays a role in enhancing the absorption of iron from plant-based foods and boosting the immune system. It is important to include sources of Vitamin C in your diet, and lemons are a great natural source of this vitamin.