Answer:
The correct answer is letter "A": Introduction.
Step-by-step explanation:
The introduction of a cover letter provides the reader with the identification and contact information of the sender. It also includes the date in which the document is being sent and before proceeding with the body, the name and address of the company to whom the letter is sent must be stated as well. The introduction in some cases is broken into two parts: the heading -where the contact details of the sender are shown, and the introduction itself where the date and company details are written.