When a Researcher Tests a Hypothesis,he or She Is Often

When a researcher tests a hypothesis,he or she is often hoping to gather information that is consistent with a particular theory.When,more specifically,is a researcher able to say that he or she has "proven" a theory?

A) Any time a hypothesis is confirmed
B) Any time a hypothesis confirms one theory and simultaneously disconfirms at least one other theory
C) Any time a hypothesis confirms one theory and simultaneously disconfirms all other theories
D) None of these; a researcher is never able to say that he or she has "proven" a theory.