Final answer:
Scout and Jem get air rifles for Christmas from Uncle Jack Finch, not the items listed in the question choices. The rifles play a significant thematic role in 'To Kill a Mockingbird'.
Step-by-step explanation:
Scout and Jem receive air rifles for Christmas via Atticus's younger brother, Uncle Jack Finch, the doctor. None of the options provided in the question are correct. The gifts are significant in Harper Lee's novel, "To Kill a Mockingbird", as they come with the important lesson from Atticus: "Shoot all the bluejays you want, if you can hit 'em, but remember it's a sin to kill a mockingbird." This advice is not just literal but also metaphorical, indicating the importance of discerning what is truly harmful from what is innocent and should not be harmed.