1 answer:
1) if you travel in space for several months, you are an astronaut.
2 if they really want to terraform Mars then they should be quick about it
4 if you work hard enough you will be able to get it sooner than later.
5 if Alyssa manages to go to Mars sure will not be able to come back anymore
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I feel that C. is definitely one of the answers. D. might also be an answer.
The answer is obvious letter B