What part of the cover letter explains how the applicant’s qualifications meet the needs of the company?
a. header
b. introduction
c. argument
d. closing

The correct answer should be C. Argument.

In the introduction you usually write where and how you found out about the position or the internship, in the closing section you usually write how you look forward to hear from them, and in the header you usually write the name and the title of the person to whom you're writing.

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