The mood gradually becomes hella depressing because their son dies and all that.
It is science fiction because it depicts an example of a phenomenon that is not fully accepted by mainstream science. In this case, the phenomenon is E.T., because it is an extraterrestrial life form, and extraterrestrial life forms are not proven to exist, they are only speculation.
An interior monologue is a piece of writing expressing a character's inner thoughts and the best answer among the following choices would be the last choices that states "Is this really what I've become? And yet, no one has said anything to me". I hope you are satisfied with my answer and feel free to ask for more
