Final answer:
The ad format that cannot run with even pacing set on the insertion order is audio ads, due to platform limitations or inventory access methods. The correct answer is d) Audio ads.
Step-by-step explanation:
The ad format that cannot run with even pacing set on the insertion order is d) Audio ads. When setting pacing for an insertion order, it is important to consider the ad format capabilities.
Even pacing is designed to spread the delivery of the ad evenly over the time period set for the campaign. However, audio ads, which typically play on streaming services, may not support even pacing due to platform limitations or how the inventory is sold and accessed.
Therefore, advertisers aiming to use even pacing must opt for other ad formats such as display ads, video ads, or native ads.