Since no choices are presented, I'll just list down the parts of a cover letter.
A cover letter is a one page document that is attached to a resume. It has 5 parts.
1) The Salutation : Dear Hiring Manager,
2) The Grab - Opening Paragraph - introduction about yourself and your immediate qualification on the position you are applying
3) The Hook - Second Paragraph - examples of work performed and its results
4) Paragraph of Knowledge - Third Paragraph - knowledge you have about the company and its needs in connection with your application.
5) The Close - Fourth Paragraph - quick summary of what you are offering and how they can contact you.