(GIVING BRAINLIEST! HELP ASAP!!!)Which sentence best describes the author's tone?

A. As the events unfold in each chapter, the tension increases quite a bit
B. The description of the bright blue sky and open fields creates a calm feeling
C. There is a sense of relief when the main character defeats the monster
D. The way the character treats others shows the author approves of her.

I'm thinking its D but please help and explanations are appreciated