The main purpose of the closing section of a cover letter is to let the reader know how he or she can contact you. Thus, the correct option B.
A cover letter may be defined as a type of document which is consist of only one to two pages that introduce yourself and summarizes your professional background in front of an audience or third person.
The closing section of a cover letter illustrates your contact information and lets the reader understand how he or she can reach you if there are any inquiries, statements, or references about what you have written or done in your past life.
Therefore, the correct option for this question is B.
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