Answer:
The Heading. This part informs the reader where the letter was written from. ...
The Salutation or Greeting. It is a courteous way of starting a letter. ...
The Body or The Message. This is the most important part of the letter. ...
The Subscription. The Subscription is used to end the letter. ...
The Signature.
Explanation:
What’s the text what’s the article about ??
One of the answers that could fit in the blank is better.
Hope this clarifies your doubt.