Overall, Thoreau wanted to prove that not everyone will easily flow with the rules of society. As a result, he calls the people who go different paths than the ones of society "different drummers."
In conclusion, your final answer should be A.
Sarcasm is a example of verbal irony.
The prefix of the word (un)beatable means “not”
The answer is B. because this is the only answer that is an immediate call to action for the situation, instead of just telling you facts like the other answers, this answer tells you straight up what you should do.
I believe it's A. It is objective, with the purpose of informing people about the significance of cell phones hope this helps :)