Emily is preparing a presentation to teach elementary students about safe swimming. which tone is most appropriate for this purpose?
a formal tone, because her purpose is to frighten young children
a formal tone, because her purpose is to educate parents and teachers
an informal tone, because her purpose is to inform young children
an informal tone, because her purpose is to entertain parents and teachers

The third choice is correct: "an informal tone, because her purpose is to inform young children." this correctly identifies her audience, for one. two of the answer choices mention "parents and teachers" which are irrelevant in this case, because she's creating the presentation for the students, not the teachers/parents. the first answer choice lists her purpose as "frightening" the young children, which is entirely incorrect--she doesn't want to scare them, she wants to explain to them in a slightly informal way, because children wouldn't really understand "formal" language.