Final answer:
The targeting method that can be used to show ads to users searching for custom t-shirts is keyword targeting. Keyword targeting allows advertisers to select relevant keywords related to their products or services, and when users search for those keywords, their ads will appear.
Step-by-step explanation:
The targeting method that can be used to show ads to users searching for custom t-shirts is keyword targeting. Keyword targeting allows advertisers to select relevant keywords that are related to their products or services.
Advertisers can then bid on those keywords, and when users search for those keywords, their ads will appear.
For example, if an advertiser wants to target users searching for custom t-shirts, they can select keywords like 'custom t-shirts', 'personalized t-shirts', or 'design your own t-shirt'.
When a user searches for these keywords, the advertiser's ads will be shown to them.
This targeting method is effective because it helps advertisers reach users who are actively searching for specific products or services, increasing the chances of a successful conversion.