I would say D. Ā
A is incorrect by simple reasoning.
B is also incorrect. A hypothesis is made before evidence supports it, therefore, it doesn't matter if all evidence supports it, Ā as it shows an guess. It sometimes can also lead to more experimentation even if it's not true for the current experiment.
C is also incorrect. An untestable hypothesis isn't useful as you cannot test anything relating to it, and it cannot be proven or disproven.
Hope this helps!
