In an essay written in a formal style, the kind of tone that the writing should have is: Objective.
An objective tone is a tone where the writer states the facts of a matter. He takes no sides but simply states matters as they are. When writing a formal essay, it important to be objective.
This will require that the facts of the matter are presented and backed by evidence. So, option C is right.
Learn more about formal essays here:
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North Atlantic treaty organization
The answer would be D because colons go before lists and the word run started the list of the errands
B. when you add that to the sentence it blends together better then the other options did.
