What is not a part of the format for a letter to the editor?

Double spacing-+? This question is confusing because I'm not sure what it's supposed to be compared to, is it a multiple choice question? What IS apart of the format to a letter to an editor is your name and address preferably on the top right and the editor's name and address in the top left of the header, a proper intro, a salutations, correct indentation and paragraph spacing, and to make your point and end your train of thought properly to capture your reader's attention.

explanation:

it's important for any number of settings.   but then i'm a retired teacher and my view may be biased.

it certainly will not weigh as a minus when applying to a college, while poor grades always work against you.

other factors are important like what you do to improve the community.