How can campaign performance be improved through the use of Explanations?

By letting marketers see the top asset combinations for each campaign type in an account
By letting marketers review recommendations for headlines and descriptions in order to make stronger ads
By letting marketers understand why performance changes were made in just a few clicks
By letting marketers determine what level a budget should at in order to achieve maximum performance

The correct answer is:

By letting marketers understand why performance changes were made in just a few clicks.