Which of these notifications texts will most likely have a formal tone

A geography textbook will most likely have a formal tone. The other three choices will probably have an informal tone. Informal tone is best for texts which requires spoken conversation or when the idea you are writing is best expressed in a way that you are like conversing with your audience while formal tone are for texts which has a serious objective or topic. Formal writing is also written in a third person point of view.

i think that the answer is a

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