Our whole lives we were taught the difference between right answers and wrong answers.
Right answers are allowed to move on to the next phase, whereas wrong answers are being punished.
So whenever we know the right answer 100% for sure, we raise our hands.
And whenever we don't, we don't raise our hands.
Unfortunately, outside of school, there is no way of knowing anything 100% for sure.
And the only way to find the right answer is by trial and error.
By giving as many different answers as possible that usually turn out to be wrong , until you've found the right answer....