system
A chat on subreddit /r/me_irl
human
It's a paradox,  by choosing which one is right, you thus prove it wrong, there for all answer are neither right or wrong.

[EDIT: Thanks for all the up votes]
gpt
Meaning the correct answer is e) 0% 

The paradoxical nature means a-d are incorrect, so if you randomly picked an answer, there’s a 0% chance you’re correct. The only way you could be correct is writing your own answer of 0%