HMS, BM EQ-Bank 898 MC Which micronutrient would be most important for an athlete experiencing iron-deficiency anaemia that is affecting their cardiovascular endurance? Vitamin D Zinc Iron Calcium Show Answers Only \(C\) Show Worked Solution C is correct: Iron forms haemoglobin for oxygen transport; deficiency directly impacts cardiovascular endurance. Other Options: A is incorrect: Vitamin D aids calcium absorption and bone health, not oxygen transport. B is incorrect: Zinc supports immune function, not related to iron-deficiency anaemia. D is incorrect: Calcium supports bones and muscle contraction, not anaemia.