Answer: On Christmas Day, Atticus takes his children and Jack to Finch's Landing, a rambling old house in the country where Atticus's sister, Alexandra, and her husband live. There, Scout endures Francis, Alexandra's grandson, who had been dropped off at Finch's Landing for the holiday.
Explanation:
I believe it's B! Participle phrases typically take the sentence and add some sort of modifier. An example of this that I've found is "Removing his pants, Ron jumped into the water to save the child." Another one is "The art museum, destroyed by a hurricane, was never rebuilt." The modifier can be removed from the sentence and it would still make sense.
If I was going to answer something in a paper form, I would research up on the topic and start to think of my own ideas, while writing down other ideas or transitions that will smoothly relate everything.