Validity of any inductive conclusion assumes that nature acts in a regular way, however there is no guarantee that the things will happen in the same way in future, this issue is known as the problem of induction. It is called ‘problem’ because it is always possible that one or more future cases will have a disconfirming case. Thus, inductivist theories provide probabilistic knowledge at best, or provide knowledge that is based on what is observed so far. The correct answer is C.