Which of these vitamins or minerals is paired incorrectly with its function?

The pairing of Vitamin D with its function is incorrect because Vitamin D is primarily associated with the regulation of calcium and phosphorus in the body, which is essential for maintaining healthy bones and teeth rather than focusing specifically on the maintenance of eyes and skin. While Vitamin D does play a role in overall health, including skin health, its main recognized function is to facilitate the absorption of calcium for bone health, not to directly maintain eye and skin health.

In contrast, the other options accurately reflect the established functions of those vitamins and minerals. Iron is crucial for the formation of hemoglobin in red blood cells, which is necessary for healthy blood. Calcium is vital for the structural integrity of bones and teeth. Vitamin B complex contributes to energy metabolism by helping the body convert food into usable energy. Each of these represents an accurate pairing with its respective function, highlighting the specific roles that each vitamin and mineral plays in maintaining overall health.