The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.
Although it has not been confirmed such proteins in whole milk are inducing in children under 12 months milk allergies, most pediatricians advise waiting until the child is one year old before introducing whole milk into his or her diet.（）
A. such proteins in whole milk are inducing in children under 12 months milk allergies
B. that under 12 months the proteins in whole milk can induce milk allergies in children
C. of proteins in whole milk inducing milk allergies in children under 12 months
D. the proteins in whole milk can induce milk allergies in children under 12 months
E. that the proteins in whole milk can induce milk allergies in children under 12 months