The sender’s address on the envelope is called the address.

The answer is return address. In the case when the letter was not able to reach the person that it is intended to, the courier or post office can return the letter to the sender. It is very important that letters have return addresses because they are usually private and confidential. If they fall into the wrong hands, the information inside the letter can be used against the person involve

Ibelieve it's choice d.