Which statement is most appropriate to include in the closing of a cover letter?

Thank you for giving me the opportunity to briefly present my qualifications. I am confident I can benefit your company. I hope you will call me soon so we can talk. I can be reached at $(435)555-3642.$

Of course, I am the best candidate for this position. Your company would be lucky to have me as an employee. My three years of experience in a fast$-$paced office environment, my practiced organizational skills, and my attention to detail more than qualify me for this position. Please call me at $(435)555-3642.$

My three years of experience in a fast$-$paced office environment, my practiced organizational skills, and my attention to detail will benefit your company. If you see that my qualifications are a match to the position, please call me at $(435)555-3642$ before $9$:$00$ AM or after $4$:$00$ PM for an interview.