Answer:
Sitting with his back against a tree a man with a face as grey as a new army blanket was serenely smoking a corn-cob pipe. The lieutenant wished to rush forward and inform him that he was dying.
Explanation:
B, a simple sentence is only an independent clause
From my my experience this usually differs depending on the type of book it is, but I think the best choice is either A, to help the reader understand new concepts, or C., It allows the reader to focus on key ideas and information during the reading. I'd pick C though, since it's more in depth and makes more sense.
B. doesn't make that much sense unless the book is an argumentative or a persuasive book.
D. only applies to personal narratives. Nobody can understand a writer's personal experiences and attitudes otherwise.
George III in one of my history book he was known as the mad king who lost america