Final answer:
Jack should create Responsive Search Ads to provide various headlines and descriptions for Microsoft AI's optimization. This ad type helps in automatically selecting and testing the best combinations for improved performance and increased click-through rates.
Step-by-step explanation:
If Jack wants to provide a variety of headlines and descriptions for Microsoft artificial intelligence to automatically select the best combination, he should create a Responsive Search Ad. This ad type enables advertisers to input multiple headlines and descriptions, and Microsoft's AI will test different combinations and learn which performs the best over time. This allows for a more efficient optimization of ads to improve performance and click-through rates.
Responsive Search Ads are beneficial because they save time in ad creation, automatically adjust to show more text and increase ad presence, and provide the flexibility needed to compete in auctions across a wider array of queries.