You're setting up keyword insertion for your Search campaign to promote a new line of sustainable socks so that the ad text dynamically adjusts to match queries like “sports socks" and “dress socks." If the keyword can't be replaced, however, you want the ad to serve the default phrase “sustainable socks.” How should you set up this keyword insertion in Google Ads?

The correct option is {keyword: sustainable socks} because this syntax properly implements keyword insertion with a default value. When a user's search query matches a keyword in your ad group, Google Ads will dynamically insert that keyword into your ad text. If the keyword cannot be inserted (e.g., it's too long, or the ad group has no matching keyword), the default text "sustainable socks" will be displayed instead. The other options are incorrect: {keyword: sports and dress socks} uses a phrase that is unlikely to be a single keyword and doesn't provide a clear default. {keyword: sustainable} socks separates the default, which would result in "sustainable" being the default insertion, followed by the static word "socks." {keyword: sports and dress} socks similarly separates the default, leading to an incomplete default phrase.