Final answer:
The correct letter style where all lines are flush left except for the dateline, complimentary closing, and signature is full block style.
Step-by-step explanation:
The correct answer is A. Full block.
In full block style, all lines of the letter are flush left, except for the dateline, complimentary closing, and signature. The content of the letter, including the body paragraphs, date, and sender's information, is aligned to the left margin.
For example:
123 Main Street
Anytown, USA 12345
Date: October 1, 2022
Dear Mr. Smith,
Body of the letter goes here.
Sincerely,
Your Name