Which Part of a Search Ad Isn’t Automatically Generated By Dynamic Search Ads?

Description line

Answer: The description line is the correct option as it is a dynamic search ad that cannot be generated automatically.

•  All of these are automatically generated
• Destination URL
• Description line
• Headline

Explanation:  Dynamic Search Ads automatically creates customized headlines and click-through URLs for your client’s search terms, and submits Dynamic Search Ads to the Google Ads auction based on your template. You just need to create the description in the template in advance. All other processing is automatic and based on customer search terms.

For more click here : https://support.google.com/google-ads/answer/2471185