Answer:
D: align the content with the ad's purpose
Step-by-step explanation:
A makes people wait, which isn't good and makes people annoyed. B basically makes your target audience think "oh this isn't for me" as if half of your content is one thing and half of it is another thing, they will most likely be dissatisfied half the time. C will increase loading times, and ads are always hated. Pop up ads are intrusive unlike ads off to the side, so they will make people extra irritated. They will generate revenue, but the question asks what will improve the experience, not the profits. D makes it so that people get what they expect and will probably spend more time there/interact more.