On the Google Display Network, your ad is eligible to show on a webpage if your:

 

• keywords match that webpage’s content
• ad text matches that webpage’s content
• landing page matches that webpage’s content
• website matches that webpage’s content

Correct answer is:

• keywords match that webpage’s content

Explanation: Google’s system analyzes the content of each webpage to determine its central theme, which is then matched to your ad using your keywords and topic selections, your language and location targeting, a visitor’s recent browsing history, and other factors.