After reading excerpt represented above I can clearly see the right answer from the scale attached above. Definitely, this paragraph uses standart compare-contrast organization, so now it is clear that the only correct option is the first one A. Comparison and contrast; cause and effect. Especially such words<span> as "however" and "on the other hand" are the prompts for you to understand why I think so.</span>
Answer:
the answer is d.first letter
Paired conjunctions
Either......or
Neither......nor
Not only.....but
Iwill go either to Rio or Bahia on my vacation
Neither John nor Mary speaks French
Not only does he speak French,but also German
