The subject line of a letter denotes the ___________.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → main idea of the letter.
The subject line of a formal letter is a short line, written just before the salutation, that tells the reader in a few words what the letter is about. It states the main idea or purpose of the letter.
Example: The subject line "Request for a transfer certificate" tells the principal at once why the student is writing.
Why the Other Options are Incorrect?
Option 2: questions raised in the letter. — Incorrect. Any questions are asked in the body of the letter, not in the subject line.
Option 3: conclusion of the letter. — Incorrect. The conclusion comes in the last paragraph of the body, before the complimentary close.
Option 4: deadlines for a task. — Incorrect. A deadline, if any, is a detail given in the body; the subject line names the topic of the whole letter.