Why is it important to be selective about which ads to test in an A/B testing program?

• A. They always produce better results.
• B. A/B tests take time and budget, so strategic decisions are necessary.
• C. They should test all ads.
• D. They are free

Answer: (B)

Selecting which ads to test matters because A/B testing uses real resources—time and budget—to determine if one ad truly outperforms another. Running tests requires enough impressions and conversions to reach statistical significance, so testing every ad would waste those resources, slow down learning, and reduce the reliability of results. By focusing on ads with the greatest potential impact or the most uncertainty, you get faster, more actionable insights and better return on testing effort. This approach also helps manage the risk of false positives from testing many variants and keeps the overall testing plan efficient and aligned with business goals.