Which of the following is the developing world’s most common cause of preventable brain damage and impaired psychomotor development?
a. vitamin a deficiency
b. iodine deficiency disorder
c. protein-energy malnutrition
d. iron deficiency disorder

its b. iodine deficiency disorder I got it right

it would lead to upper respiratory infections and pneumonia.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.