Which of the following is correctly identified as a major mineral rather than a trace mineral?

• A. Iodine, because its daily requirement always exceeds 100 mg per day in adults.
• B. Calcium, because typical dietary requirement is well above 100 mg/day.
• C. Molybdenum, because molybdenum is found in large quantities in bones and teeth and required in amounts similar to calcium.
• D. Iron, because it universally meets the >100 mg/day threshold for major minerals in all individuals regardless of age and sex.

Answer: (B)