I would go with option D, Read it aloud to yourself.
Whenever I write an official letter, I read it aloud to myself, just to make sure i have written everything right. And also is it making sense or not. Also the purpose of the letter has been delivered successfully.
So this is the strategy I take initially after writing an official letter just to check if there is any error or not. Or does it require any correction.
In this way I usually identify my mistakes if I have done in the letter. Then I correct them and read it again. Through this way, i can identify the purpose of the document, I can define my audience, and i can delete/change all the long or repetitive words.