Answer:
The answer should be
Informal
because it contained information that was to inform the readers of the content.
The sentence that reflects the theme of magic in this excerpt is: "The withered tree at once burst into full bloom".
Annihilate and decimate both mean to destroy something or someone, but annihilate means to destroy something as a whole, and at a bigger scale, while decimate doesn't have to mean destroying the whole thing.
Eradicate and massacre are both violent words with the intent to convey destruction, but eradicate is a more general term, as massacre is meant to simple destroy/kill a large group of people.
Frances and her brother are the subjects, maybe students for the verb..? I don't particularly know.
