Correct option is B
Seaweeds are an important natural source of iodine. Iodine is an essential trace element that is crucial for the production of thyroid hormones, which regulate metabolism. Seaweeds, particularly brown algae such as kelp, contain high concentrations of iodine, which they absorb from seawater. This makes them one of the most significant natural sources of iodine, widely used in the food industry, medicine, and agriculture.
