Option 1: (D), (B), (A), (C) -> Forms: "There's a growing body of research proving that exercise helps build key connections between the networks within the brain, improving overall cognitive performance and stalling the onset of Alzheimer" - grammatically correct and logically flowing sentence.
Option 2: (D), (A), (B), (C) -> Results in a jumbled sentence where "networks within the brain" comes before "exercise helps build," breaking the logical flow.
Option 3: (C), (A), (B), (D) -> Starting with "performance and stalling" makes no grammatical sense as an opening clause.
Option 4: (C), (B), (D), (A) -> Also starts incorrectly with "performance and stalling," creating a meaningless sequence.
Hence, Option 1: (D), (B), (A), (C) -> The sentence logically begins by introducing research evidence, then states what exercise does (builds connections), specifies where (between brain networks), and concludes with the beneficial outcomes (improved cognition and Alzheimer prevention) -> correct