Answer: B. securing US embassies abroad
Step-by-step explanation:
A DSS agent, or Diplomatic Security Service agent, is a member of the U.S. Department of State's security and law enforcement arm. Their primary mission is to provide a safe and secure environment for the conduct of U.S. foreign policy. This includes securing U.S. embassies and consulates abroad, protecting diplomats and other high-ranking officials, and conducting investigations related to passport and visa fraud.