The correct answer is A. Re-read your letter, looking for spelling and punctuation errors.
Step-by-step explanation:
The revising stage is one of the stages of the process of writing any type of document, this stage usually is the stage that follows the first draft writing stage. This means during the revising stage you mostly re-read the draft of the letter in order to find any type of mistake (spelling, grammar, punctuation, style) to correct and improve it before sending the letter. In the case of non-professional writers, this process implies revising multiple time to avoid any error to be in the final version of the letter or document you are writing. Additionally, it is recommended to wait sometime after finishing the process of time and before beginning the one of revising as this will allows you to take a look to the letter again from a critical objective perspective to determine the mistakes that should be corrected. Thus, the action that is part of the revising stage of writing a letter to the editor is Re-read your letter, looking for spelling and punctuation errors.