Most like D. since certain setting's can be different and have different tone, the most overused setting explanatory is " It was a dark and stormy night". You may or may not be familiar with this but it's used in most horror stories and a few non horror stories, however just by reading that line people can imagine a huge chunk of the character's setting and it set's the mood/ tone gloomy is mostly used to describe a dark setting. When a narrator describes the setting more in depth by saying "it was dark and stormy night, and a tall castle was standing atop a mountain as if looking down on the people living below it." That would make the character know that it was a scary place and prepare the reader for a terrifying story ahead of them.
All of us have asked ourselves this question at least once in our life. What if school never existed? We left it at that but in this essay we'll disccuse what would be the effect of no school.