What is a writer's journal used for

A journal is a written record of your thoughts, experiences, and observations. You can write in your journal daily, or only when you feel the urge. You can write with a fountain pen in a leather-bound book if that inspires you, or you can write with your lucky pencil on the backs of dollar bills if you are both superstitious and rich. It's entirely up to you

The answer would be c

To persuade someone not to take a particular course of action