Answer:
The correct answer will be that can be tested.
Step-by-step explanation:
A scientific question is a question which can have the real answers based on the observations which can be tested from the experiments.
To test a question, a hypothesis or an opinion is derived from the observed facts which can be tested in-vitro and in-vivo through experiments and can also be well supported by the experiment of others.
Thus, can be tested is the correct answer.