The place has a microgravity environment. Astronauts live and conduct research here.
A: The place has a microgravity environment where astronauts live and conduct research.
B: The place which astronauts live and conduct research has a microgravity environment.
C: The place where astronauts live and conduct research has a microgravity environment here.
D: The place where astronauts live and conduct research has a microgravity environment.