29.
(A) The conclusion of the Bristol study may help solve the problem.
(B) It could be that vitamin D has more of an impact on the aging brain.
(C) This study, therefore, wanted to determine if the same might be true in teens.
(D) Previous findings of a link between vitamin D levels and brain power have led to calls for changes to such advice.
(E) The children’s grades in English, math and science were evaluated when they were