Respuesta :
The word with the prefix post that means a message added at the end of a letter after the writer's signature is
- C. Postscript
Postscript is an additional message typically appended after the signature of a writer. It can also be an additional piece of information after the writer of a text or message has appended the main information.
An example of a sentence that can be constructed with this word is;
- After concluding the letter, Jane added a postscript thus; I love you.
Learn more here:
https://brainly.com/question/21514027