Ahypothesis: a: can be tested b: is a prediction about the expected outcome of an experiment c: must be stated in a form that can be either proven or disproven d: all of the above are true

A hypothesis 
-Can be tested
-Is a prediction about the expected outcome of an experiment
-Must be stated in a form that can be either proven or disproven

Your answer is D: All of the above are true

The correct answer is "hydrogen".