Answer:
C) Helen falls in a heap on the floor and begins to sob because she has never felt so lonely.
Explanation:
From the paragraph, the tone is that of loneliness and regret at leaving home because she is not sure she made the right decision.
So falling in a heap and sobbing because of her loneliness consistently reflects the tone of regret and loneliness.
Answer: I'm not going to write your whole essay for you, but some good reasons to use would be: A change in atmosphere, they can experience what life is like on a different planet, they can get a chance to learn more about mars or anything else about space, and they can compare and contrast how different mars is from earth along with make new memories on a different planet.
I think prophase because that is what I learned in science class
Any .gov website because it is official and trustworthy.