Option A answers the text best.
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 celebratory dinner
Explanation:
the sentence is basically about the dinner, and roast beef & mashed potatoes is what the subject (the celebratory dinner) <em>is.</em>