The correct answer is option 3: Vitamin C. Vitamin C has been known for its immune-boosting properties and its ability to help control infections in the human body. It plays a crucial role in supporting the function of various immune cells and helps in the production of antibodies that fight against pathogens. Vitamin C also acts as an antioxidant, protecting the immune cells from damage caused by free radicals. It also aids in the synthesis of collagen, an essential protein that helps in the healing process. Although other vitamins, such as Vitamin A, are important for maintaining a healthy immune system, Vitamin C specifically stands out for its direct involvement in controlling infections.