The subject line of a letter denotes the ___________.

main idea of the letter.

The subject line of a letter denotes the main idea of the letter.

Here's why:

• The subject line is a brief yet informative phrase that appears at the top of a letter. Its primary purpose is to provide a concise overview of the letter's main content.
• While the subject line might touch upon questions raised, conclusion points, or deadlines in some cases, these are rarely the primary focus. It mainly aims to catch the recipient's attention and give them a quick understanding of the letter's purpose.
• The other options are less accurate:
  • Questions raised in the letter: The subject line might not always specifically mention questions, and often focuses on the broader topic or issue.
  • Conclusion of the letter: The conclusion summarizes the main points, not the subject of the letter.
  • Deadlines for a task: Deadlines might be mentioned in the subject line for specific types of letters (e.g., business correspondence), but it's not the general function of a subject line.