- Similar ads by competitors
- Goals and analytics
- Site experience
- Content and formatting
The Correct Answer is: Content and formatting
Content and formatting criteria are reviewed by Google ads to make sure that Search ads are compliant with Google’s advertising policies. After you create or edit an ad or extension, the review process begins automatically. The content in your ad will be reviewed, including your headline, description, keywords, destination, and any images and video.
Read more here: https://support.google.com/adspolicy/answer/1722120