In letter writing, the sender's address is mentioned __________.

(A) on top left side
(B) below left side
(C) before the body of letter
(D) below right side

Choose the correct answer from the options given below:

(A) Only

The correct answer is (A) Only.

The sender's address is typically mentioned on the top left side of the letter. This is a standard format that is widely recognized and considered professional.