An advertiser wants to capture existing demand for their brand by reaching shoppers already considering the brand. Which stage of the customer shopping journey should they target?

The correct answer is "Purchase." The "Purchase" stage of the customer shopping journey is the most appropriate stage for capturing existing demand and reaching shoppers who are already considering the brand. At this stage, potential customers are in the process of making a buying decision, and they may already be familiar with the brand. By targeting shoppers in the purchase stage, the advertiser can influence their final decision and encourage them to complete the transaction. This is the optimal time to engage these customers, as they are closer to converting. In contrast, targeting the Awareness stage would be more focused on reaching new customers who may not yet be familiar with the brand, while the Loyalty stage targets customers who have already made a purchase and are being engaged for repeat business.