Fickle means changing frequently especially as regards to one’s loyalties or affections
A hoax is just fooling people. A joke, a fraud. Something that isn't true. A deception. It can be humorous or make people feel bad, so it could be either C or D. I can't tell which it would be but it could be both.
The answer to this question is A. when you do not have a sufficient amount of strong supporting evidence
Have a Nice day
Sure you’re wasting your points rn but sure