• Amazon Clean Rooms
• AMC API’s
• Amazon DSP
• Seller Central

The correct answer is: Amazon DSP

Explanation: AMC audiences can be activated in Amazon DSP for use in programmatic ad campaigns. After building (and qualifying) custom audiences in AMC, advertisers can select those audiences in the Amazon DSP platform just like standard audience segments.

Reference content: From the official Amazon documentation (Advertiser audiences):

“The Advertiser audience API allows you to create advertiser first-party audiences in AMC and Amazon demand-side platform (Amazon DSP).”

Also, from the AMC custom audience launch announcement (Amazon Marketing Cloud announces custom audience creation and activation feature):

“…Advertisers can now build custom audiences in Amazon Marketing Cloud (AMC) using SQL queries, and activate these audiences for use in Amazon DSP campaigns.”