The correct answer is B: to express formality.
What does formality mean in writing?
Formality in writing refers to how well you follow standard English conventions, how often you use slang or idioms, how objective you are about your topic, and how familiar or intimate you assume you are with readers
What does out of formality mean?
1 a requirement of the rule, custom, etiquette, etc.
2 the condition or quality of being formal or conventional.
3 strict or excessive observance of form, ceremony, etc.
4 an established, proper, or conventional method, act, or procedure.
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