Sorry I really don’t know what time of questions is this
A. They add a bit of humor to a serious mood. The fact that she asked them to bring her back a job is just funny, so it is definitely A.
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.
The speaker must keep in mind what the audience wants to hear.
