What does arrears mean in paragraph 3 of A journey by Edith Wharton?

Which of the following is an example of an author’s purpose for using first-person point of view?

Which detail from the text best demonstrates the effect of totalitarianism on the animals? "progress was made in the dry frosty weather that followed." "it had been decided to build the walls three feet thick." "they were always cold, and usually hungry as well." "for a long time the quarry was full of snowdrifts and nothing could be done."

Will give read the sentence: (blank) starting to rain outside. which is the best word to complete the sentence? a : its b : its’ c : ’tis d : it’s