Question

To be a possible answer to a scientific question, a hypothesis must be testable. unique. written. controlled.

Answer 1

a hypothesis must be testable. in order to prove your hypothesis correct you have to test it.
unique is not the answer because alot of people may have the same question as you.
write and controlled is something that happens during testing

Answer 2

The best answer would be:

TESTABLE

By definition a hypothesis is a testable, educated prediction of what would happen in an experiment. It is a prediction that can be proved or disproved. If it does not possess this one quality, it overall is not a hypothesis. A hypothesis is not a statement or a claim. You need to try it out to see if it is true before it can answer any question.

As to the other choices, not all hypotheses are unique. The reason why it is testable, is to ensure that the hypothesis would stand the test of time and development. It is not necessarily written and nor is it controlled.