What does "This change" refer to? Choose the word or phrase that completes the idea.
Astronaut Chris Hadfield directly benefited from the new
equipment when he lived on the International Space Station in
2013. This change helped Hadfield stay strong during his time
in space.
Astronaut Chris Hadfield directly benefited from the new
equipment when he lived on the International Space Station in
2013. This change helped Hadfield stay strong during his time
in space.