John looked outside. It was raining. No surprise. It always rained on days when he had to wait for the school bus outside.
"You're lucky," he said to his mother. "You don't know what it's like to get up on these cold, wet mornings to go someplace you don't like."
"Yes I do," his mother said. "You tell me every morning. Now get ready for school. You're going to be late."
John put on his clothes. The sweater was woolen and itchy. His raincoat felt heavy and cumbersome. He walked outside to the bus stop. He felt soggy, depressed, and miserable.
A passing car drove by, splashing mud onto John's clothes, soaking him to the bone. John realized that his homework and books were ruined when the water hit his backpack.
John sighed. What else could go wrong today?

This passage is set during a rainy day. How does this detail relate to the story?

A rainy day affects John's mood and makes him soggy, depressed, and miserable. This detail affects the story because John had to wait for the school bus outside, in the rain. When he went out, a passing car splashed mud onto his clothes and ruined John's homework and books in his backpack.

The rain makes his morning even worse because he has to go to a place he doesn't like - the school. All of these things affect the tone of the story,  by making it depressive, sad, and miserable, like John's mood.

his tongue, i believe, was bloody and hanging out of his mouth.

he looked as if he were hungry.

he has several wolf-like qualities; a gray coat, sharp claws and yellow fangs.

those eyes made me feel, dear reader, like the end was near.

as i reached for a stick, he moved to the other side of the hill.

panting and hungry, he looked at me, a defenseless human and he snarled.

well i said my prayers, however, he simply turned and limped off. 

b would have to be the answer