What field type is used for data pass targeting in a dynamic profile?

The correct answer is Custom value. In a dynamic profile, data pass targeting uses a "Custom value" field type. This allows you to define a specific value that will be passed from your data feed to the dynamic creative, enabling personalized content delivery based on that value. "Display & Video 360 Line Item Id" is used to identify a specific line item within DV360, not for passing targeting data from a dynamic profile. "Remarketing Value" is a general concept related to audience targeting, but not a specific field type for data pass targeting in this context. "Campaign Manager Site ID" identifies a site within Campaign Manager, which is different from a field type for dynamic profile data pass targeting.