The correct answer is C. Dreary.
This is because Le Morte d'Arthur is full of melancholy inducing moments due to the fact that everything will fall apart at a certain point. Arthur's death, and his loss, is inevitable, so is the fall of Camelot, and of his Knights of the Round Table.
"Feeling appreciated is one of the most important things in a happy family. All of the family members should say how much they appreciate each other, how great it is that they have each other, how much they love each other, and how grateful they are for everything they do for each other."
The words such as blood-bedewed and corpse-like in the phrases given above give off a sinister tone. The words blood and corpse relate to death, a dark atmosphere, or hints that something threatening or harmful is about to happen or has happened. The word "sinister" best describes the tone used in these phrases.