The line that best paraphrases the excerpt is A. And when I think that I’ll never see you again, beautiful creature (...).
To paraphrase is to express the meaning of something by rewording it in a different way. Both the excerpt and option A express the same: that the poet is considering the possibility of never looking at the beautiful "creature" again.
2 for the first and 3 for the second
When we say colloquialisms, these are words that are written informally in a literary work. Therefore, when writing an analytical essay, we should make sure that colloquialisms should be limited. It should be limited since an essay should be presented formally. The answer for this would be option D.
The study of the structure an behaviour of the physical and natural environment by oberseving through scientficic instruments and through experiments.