From which of the following locations may an FCC-licensed amateur station transmit?

An FCC-issued amateur radio license grants you operating privileges within the United States, its territories, and its possessions. Furthermore, FCC jurisdiction legally extends to any vessel or craft that is documented or registered in the US, provided it is located in international waters. However, your FCC license does not grant you blanket authority to transmit from within foreign sovereign nations. Just because a country belongs to the UN or ITU does not automatically authorize you to operate there. To transmit from another country, you would need a reciprocal operating agreement or a local license issued by that specific host country's telecommunications authority.