Vitamin E is classified as an antioxidant, which means it helps protect cells from damage caused by harmful molecules called free radicals. Antioxidants like vitamin E neutralize these free radicals, preventing them from causing oxidative stress and potential harm to the body`s cells.

Option 1, "Anti-coagulant", is incorrect because vitamin E does not have a direct effect on blood clotting. Anticoagulants are medications that help prevent blood clots from forming or growing larger. Vitamin E does not possess this property.

Option 2, "Anti-rickets", is also incorrect. Rickets is a condition caused by a deficiency of vitamin D, calcium, or phosphate. Vitamin E does not play a significant role in preventing or treating rickets. Vitamin D, on the other hand, is essential for healthy bones and prevents rickets.

Option 4 states that vitamin E is "none of these", which is incorrect. As mentioned earlier, vitamin E is indeed an antioxidant. Therefore, option 3, "Anti-oxidant", is the correct answer.

In conclusion, vitamin E is an antioxidant that helps protect cells from damage caused by free radicals. It does not have any direct impact on blood clotting or the prevention and treatment of rickets.