Answer:
The correct answer to your query would be the Second Answer Choice;
Heading, Introduction, Argument, Closing.
Explanation:
Here is an example of a cover letter,
Heading (Short Intro to what it is EG: School Problems, as well as your info)
Introduction (What this is about EG: I believe we don’t……..)
Argument (Why your view is correct, USE EVIDENCE EG: Many kids don’t get………)
Closing (Wrap up what it was about EG: All in all, this should be here so that….)
Anything out of this order would not make sense, so B is therefore correct.