Which of these substances is likely to be deficient in the diet of a person...

Explanation

This question is asking which substance is likely to be missing from the diet of a person with goiter. Goiter is a condition where the thyroid gland in the neck becomes enlarged. The thyroid gland produces hormones that regulate metabolism, growth, and development. Out of the options given, the correct answer is Option C: Iodine. Iodine is an essential mineral that the thyroid gland needs to produce hormones. Without enough iodine, the thyroid gland cannot produce enough hormones, which can lead to goiter. Potassium, calcium, and sodium are also important minerals that the body needs, but they are not directly related to the development of goiter. However, having a balanced diet that includes these minerals is important for overall health. To prevent goiter, it is important to consume enough iodine-rich foods such as fish, seaweed, dairy products, and iodized salt. If someone is diagnosed with goiter, they may need to take iodine supplements or medication to regulate their thyroid hormone levels. In summary, the substance likely to be deficient in the diet of a person having goiter is iodine.