Which of the following need not be mentioned in the informal letter ________?

Subject

The option that need not be mentioned in an informal letter is Option 2: Subject.

Informal letters are typically written to friends, family, or close acquaintances, so a formal subject line is not necessary. The other options, such as the date, salutation, and complimentary close, are all considered standard elements of a letter, even in informal settings.

Here's a breakdown of each option:

• Option 1: Date: While not essential for every informal letter, it's generally helpful to include the date to provide context and for your recipient's reference.

• Option 2: Subject: A subject line is primarily used in formal letters to briefly summarize the main topic of the letter. In informal letters, where the content is more personal and conversational, a subject line is not typically needed.

• Option 3: Salutation: The salutation, such as "Dear [Recipient's Name]," is always appropriate in informal letters as it sets the tone and establishes a personal connection with the recipient.

• Option 4: Complimentary Close: The complimentary close, such as "Sincerely," "Love," or "Best regards," is a polite way to end an informal letter. It conveys your closing sentiment and adds a personal touch.

Therefore, the option that need not be mentioned in an informal letter is Option 2: Subject.