Question

For the greeting in a business letter when you don't know the name of the person who will be reading it, Which of the following is least likely to conform to present-day usage?

A. Dear Mrs. Carleton
B. Dear Mr. Givens
C. Dear Sir
D. Dear Editor

Answer 1

For the greeting in a business letter when you don't know the name of the person who will be reading it, the answer which is least likely to conform to present-day usage is D. Dear Editor.
A and B are fine, since you already know the name of that person, and you wouldn't say Dear Sir, since it could be a woman as well.