The study discussed in the previous example was widely publicized. Here are three headlines in the news about the study. Which headline is the most appropriate summary of this study?

Study: Multitaskers Bad at Multitasking $($from

cbsnews.com$)$

Stanford says, "media multitasking may make you dumb" $($from

smartplanet.com$)$

Multitasking Muddles Brains, Even When the Computer is Off $($from

wired.com$)$