As a writer and reader I disagree with this. Perhaps if you are writing for a scientific journal or business report, long blocks of text can seem like you have a lot of info. Generally speaking, especially in fiction and non fiction i think unbroken pages of text will best case scenario bore a reader, worst case scenraio burden and overwhelm them with a lot of info so the feel daunted about continuing.
It is A, a gloomy day. when u think of black clouds, its gloomy, almost like its going to rain. it cant be the sun is setting because when it sets, clouds are sort of pinkish.if the clouds are moving, that really has nothing to do with the sentance. i hope this answer has helped.
Wouldn’t it be all of the above?