The correct answer is D. Iodine.
Iodine is an essential mineral that the body needs to function properly. It is needed to produce thyroid hormones, which are responsible for regulating metabolism, growth, and development. Iodine deficiency can cause a variety of health problems, including goiter, hypothyroidism, and mental retardation.
Seaweeds are a good source of iodine. In fact, some seaweeds contain more iodine than any other food. For example, 100 grams of kelp can contain up to 3,000 micrograms of iodine, which is more than the recommended daily intake for adults.
Other good sources of iodine include seafood, dairy products, and iodized salt. However, seaweed is a particularly good source of iodine because it is a natural food that is not processed or refined.
If you are concerned about your iodine intake, you can talk to your doctor about adding seaweed to your diet. You can also find iodine-rich foods at your local grocery store.