Yes A is the correct answer
The combination of citrus food in the diet may help Jared in creasing the absorption of iron by his intestine. The fruits and vegetables rich in Vitamin C and the Ascorbic acid such as lemon, oranges etc., may be used. Further, beta-carotene rich sources like carrots, apricots, beans, spinach also will also help him.
D would be the answer to this question
D. Proteins are composed of amino acids and determines all the structures and functions of the organism.