Answer:
Option (D).
Explanation:
Vitamin C is a vital nutrient, required for proper body functioning, including immune responses. It is found in high concentration in immune cells, antimicrobial activities, and promotes proliferation of lymphocytes that play role in elimination of pathogens.
Zinc also plays role in maintenance of a functioning immune system as it affects the rate of replication and cell division in the cells.
Both vitamin C and zinc are potential antioxidants, which provide a increases level of protection against common infections by improving functioning of immune system.
Thus, the correct answer is option (D).
