A deficiency of which of the following minerals is of particular concern to athletes because of its role in the oxygen transport process?

Calcium plays a crucial role in bone health and muscle contraction but is not directly involved in oxygen transport. While athletes need sufficient calcium to support skeletal strength and prevent injuries, it does not influence the delivery of oxygen to tissues like iron does.

Zinc is important for immune function, protein synthesis, and wound healing, but it does not have a direct role in oxygen transport. Although it is vital for overall health and recovery, a deficiency in zinc is less critical for athletes compared to iron, which directly affects their endurance and performance.

Potassium is essential for maintaining fluid balance, nerve function, and muscle contractions. While it is crucial for overall athletic performance, it does not play a direct role in oxygen transport. Therefore, potassium deficiency, while impactful, does not pose the same immediate concern regarding oxygen delivery as iron deficiency does.