"You can't trust Mrs. Smith. Although she has been a speech teacher for long time, she has a messy desk. You know what that means ... Dont trust what she says about Public Speaking!"

Which one is the best fallacy?
1. slippery slope
2. ad hominem
3. ad populum
4. post hoc ergo proper hoc
5. appeal to false authority
6. ad ignorantiam
7. red herring
8. ad antiquantatum ​