Read this sentence.

Larger than any other man-made structure in orbit, astronauts at the International Space Station are given a
unique opportunity to do research in a microgravity environment.

Which edit should be made to correct this sentence?
E. change astronauts to researchers
F. change astronauts at the International Space Station are given to the International Space Station gives astronauts
G. change astronauts to experimental astronauts
H. change astronauts at the International Space Station are given to a microgravity environment is given