A formal business letter should contain all of the following except a strong argument of why the reader is wrong. Option A is correct.
A business letter is a formal document that is usually sent from one company to another or from a company to its clients, employees, and stakeholders.
Each section of this letter should containthe appropriate format, including your contact information and that of your recipient’s; salutation; the body of the letter; closing; and finally, your signature.
A professional and respectful tone, a central purpose or claim, specific formatting are significant characteristics of a business letter.