Final answer:
The quote emphasizes the importance of putting knowledge into practice, and the correct option is C) Haven't learned it at all.
Step-by-step explanation:
The quote provided is from an ancient Greek philosopher named Socrates. The phrase means that if you possess knowledge but never put it into practice, your knowledge becomes meaningless. To understand the meaning of the quote in the context of the question, choosing option C) Haven't learned it at all is the correct answer. This is because if you never practice the game-changing technique despite knowing it, it is as if you haven't learned it at all, and the knowledge remains theoretical without any practical application.