What is the function of the subject heading in a letter of complaint? it gives the reader a quick understanding of the letter's topic. it the mailroom clerk sort the letter into the proper pile. it the writer deliver the message more efficiently. it serves no real function. it's just a convention of a business letter.

The correct answer is A. It gives the reader a quick understanding of the letter's topic.

Explanation:

A letter of complaint is a letter wrote by customers, workers or individuals to report and issue or problem to a seller or company, as other letters these letters follow a strict style and format. About this, one of the requirements in terms of format is to use a subject heading that summarizes in a short sentence the content and purpose of the letter and therefore helps the reader or recipient to understand the topic of this document and to have a general idea about it. Thus, the function of the subject heading in a letter of complaint is that it gives the reader a quick understanding of the letter's topic.

i used to know but i learned it a long time ago sorry

explanation: