A business letter has to have, or should have, a formal and respectful tone
I think that the answer is B
The
answer is:
A.
Correlative
Conjuctions that are used in
pairs are called correlative conjunctions. In the sentence above, the
conjuction used is “either..” plus “…or”. They may be similar to coordinating
conjuctions since they join sentences but correlative conjuctions are used in
pairs.
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