I believe it’s B, i am not for sure though, just by context clues in the text, he seems to use them to get information of when the attack is
They're. They are driving to Yellowstone National Park tomorrow. Theirs doesn't sound right in the sentence. Their means belonging to. So they're fits in the sentence the best.
Krogstad is going to try to take his job back from Mrs. Linde, and the audience knows it, but Mrs. Linde does not know that this will happen.
C the introduction of the novel
