Hey there!
Let's understand and (actually) brake down this word.
Let's consider, what does the word (assumption) really mean?
(Assum)ption, did you see what was noticed. The word "assume". This would mean to assume something, it's practically like an opinion, something you think that would be true, you're (assuming) that this/that is to be true.
So, now that we have considered what the word assumption really means, let's review your options.We would want to find an option that would state what we have just considered.
Your correct answer would be: An assumption is an idea that may be true but requires evidence to support it.
(Justification):
When making a (assum)ption, or an opinion, you would have to use supporting evidence or true details to support your claim so that it would not longer be assumed, but be a real thought or fact.
Your correct answer would be (option b)
I hope this helps you!