On te Display Network, enhanced chost–per–click (ECPC) automatically:

sets bids to help you get as many conversions as possible
adjusts your manual bid up or down based on each click’s likelihood to result in a conversion
sets bids to help you get the most clicks within your target spend amount
sets bids to maximize your conversion value while trying to reach an average return on ad spend

The correct answer is:

adjusts your manual bid up or down based on each click’s likelihood to result in a conversion

Sources: Google Ads Display Certification Course

To see all the questions and correct answers of the Google Ads Display Certification Exam, Click Here – Google Ads Display Certification Answers.