When assigning multiple audience segments to a line item, an advertiser wants to increase scale by serving ads to shoppers in any of the selected segments. Which option should they choose?

The correct answer is Or because when assigning multiple audience segments to a line item and an advertiser wants to increase scale by serving ads to shoppers in any of the selected segments, the "Or" option should be used. The "Or" operator ensures that the ad is shown to shoppers who are in one or more of the selected segments, effectively broadening the reach. This increases the scale of the campaign by targeting a larger group of potential customers who meet the criteria of any of the chosen audience segments. On the other hand, using "And" would limit the audience to those who fall into all of the selected segments simultaneously, reducing the overall reach and scale of the campaign.