Answer:
D. One cold, winter morning when I went sledding with my friend, I saw a wolf.
Step-by-step explanation:
It makes the most sense given the context of the paragraph. The sentences seem to be about a wolf protecting his territory.
Option A makes it seem like it would elaborate on the hunt the wolf goes on to get its prey, however this does not flow well with a wolf protecting his territory
Option B looks like it was taken from the middle of a passage. No where do the sentences discuss a mouse so this would not be the answer
Option C once again does not mention a mouse further nor a chase.