An athletic shoes retailer is ready to use Campaign Manager 360. They'd like to start advertising across mobile platforms, with a focus on smartphones. Which scenario represents a factor they should be aware of when advertising on a smartphone?

The correct answer highlights a common pitfall: a mobile-optimized creative is good, but if the landing page is merely a mobile website (which often means a desktop site scaled down or with limited functionality), the user experience can still be poor. A truly optimized mobile experience requires a dedicated mobile landing page or an app, ensuring fast loading times and intuitive navigation. Option A describes a creative that might struggle with connectivity, which is a general mobile challenge, but not specific to the landing page experience. Option B describes a video ad and a comparison page, which could be fine if both are well-optimized for mobile. Option D discusses creative specifications, which are important for display but don't inherently create a bad user experience post-click like a poorly optimized landing page.