Step 1: Role of Calcium in Bone Health.
Calcium is a vital mineral for bone strength and health. It is the primary component of bone tissue, contributing to bone density and structure. Adequate calcium intake is essential for maintaining strong bones, especially during childhood and old age.
Step 2: Why Other Options Are Incorrect.
- (A) Iron element: Iron is essential for oxygen transport in the blood but does not contribute to bone strength.
- (B) Protein: While protein is important for overall body health and muscle development, calcium is the key element for bone strength.
- (D) Sodium: Sodium helps regulate fluid balance but does not directly impact bone strength.
Step 3: Conclusion.
The strength of bones is primarily due to calcium, making (C) the correct answer.