While on a medical mission trip, you evaluate a six-year-old African boy who presents to the clinic with a large goiter, fatigue, low body temperature, and mental retardation. You correctly diagnose...

While on a medical mission trip, you evaluate a six-year-old African boy who presents to the clinic with a large goiter, fatigue, low body temperature, and mental retardation. You correctly diagnose his disorder, which is uncommon in developed nations due to a salt additive. Deficiency of what trace element has caused this child’s symptoms?

A. Iron deficiency

B. Selenium deficiency

C. Zinc deficiency

D. Iodine deficiency