Which of the Following Is the Best Opening for an Invited

Which of the following is the best opening for an invited or solicited message?

A) My specialized training in social media marketing strategies and experience in the advertising industry qualify me for the social media marketing manager position listed on your company's website.
B) I have attached a résumé along with this letter that extensively covers my education and work experience, and I am sure they will make me eligible for one of the positions in the firm.
C) I would like to apply for an internship at your firm. I have strong academic credentials and references that support my request for an internship. I would like to point out that I am very keen to work for your company to the extent that I am willing to do an unpaid internship in an area of my interest.
D) I have attached a résumé for a possible job offer from your company.
E) I can assure you that I am well suited to work for your company because of my experience, education, and personal qualities.