Read the following sentence from the article. Madore points out that the new findings are, for now, correlational.
Which phrase from the article BEST emphasizes what the author means by "correlational"?
(A) evolved hundreds of thousands of years ago and, for the most part, has remained largely unchanged
(8) the researchers could identify the number of lapses in their attention
tell us something important about the relationship between attention and memory
(D) action video games in particular harbor plenty of potential for improving brain function