Iodized salt is useful. Because it

Iodized salt is beneficial primarily because it (c) Controls thyroid gland. Iodine, an essential nutrient in iodized salt, supports thyroid function, preventing disorders like goiter. While a balanced diet aids digestion and overall health, iodized salt’s direct impact on (a) Digestion or (b) Resistance to diseases is minimal. Therefore, while it contributes to thyroid health, it doesn’t universally enhance digestion or disease resistance. Thus, the correct choice is (c) Controls thyroid gland. It doesn’t encompass (d) All of the above, as iodized salt’s benefits are specific to thyroid regulation.