Here are few things that I think can help you decide when stuck in between 2/3 options?
Ask yourself why this question is here? Is it because you are supposed to know this thing about this because its not a very specific knowledge?
2. What is the tricky part that the examiner is trying to test here?
Pick a question and try to apply this and see what you get.
3. Which of the option can be manipulated easily and is crucial to know?
4. If there is "none" option in geography then most likely its true..
Comments
Best option is to study. Period.