The answer may be A, if not it will be D. I hope this helped! (: If you ever need help in English, Biology, Veterinary Science, (which are my best subjects), you can always come to me. (:
The correct answer for this presented problem would be A. Article.
Articles are a kind of objective that gives more importance to the noun that it is used to describe and emphasize. As per this part of the sentence, there are currently 4 articles used. How much more when writing or delivering ordinary speeches, right? Articles are A and The, and sometimes An. Now, if the other options would outweigh articles, that would be impossible since articles are already an integral part of the English vocabulary to establish accuracy on both writing and speaking.
I think that Dickens meant to show that the world cant hide from laughter or good humour. If you see someone laughing you tend to laugh too. If you heart a funny joke you laugh at it. This world isnt just filled with nasty its also filled with fun.
Hope this helps but this is what i feel Dickens meant. the person grading your work may feel different
D. All of the choices are all correct