Answer: A. Space Station
Explanation: The International Space Station (ISS) is a habitable artificial satellite in low Earth orbit. The ISS is a joint project among several space agencies and countries, including the United States, Russia and 8 other nations. It's a research facility that orbits the Earth at an altitude of about 250 miles and it's used to conduct experiments in many fields, including medicine, engineering and materials science. It's not an ICBM (Intercontinental Ballistic Missile), a Nuclear Submarine or the World Trade Organization (WTO).