Which of the following allows vendors to run sponsored ads that appear on Amazon product detail pages and within shopping results?

Advertising is the correct answer because Amazon's advertising solutions, such as Sponsored Products and Sponsored Brands, are specifically designed to place ads on product detail pages and within shopping results. These campaigns allow vendors to increase visibility and drive traffic to their products. A+ enhanced marketing content (A+) is a feature for product detail pages that allows vendors to add rich content like videos and comparison charts, but it is not an advertising placement itself. Merchandising refers to the way products are displayed and promoted within a store or on a website, which can include various strategies, but it's a broader term and doesn't specifically refer to paid ad placements on Amazon.