I would say that it depends on the audience. Personally, a debate regarding ethics and moral dilemma is interesting. Read The Fat Man and the Impending Doom. It's just one paragraph so it's not going to bore audience.
https://thedailydilemma.wordpress.com/2007/06/18/fat-man/
I believe that this type is a lecture-forum discussion.
I would say that both A and C could be correct.
It is indeed best to keep everything objective and impersonal in formal business correspondence, but we also use words to say precisely what we mean.
B. the colder, lighter meal will taste great on this hot day.
Answer: From my understanding of a gerund phrase, I assume answer A. Learning a new language is correct.
Explanation:
The lines reveals the extent of Juliet's love for Romeo. She is ready to denounce her family name for him