D. developing a unique way of teaching by using questions.
Explanation:
Socrates was a famous classical Greek philosopher who laid the foundations on what will become modern western philosophical thinking and studies. He was also credited with what is now known as Socratic irony and Socratic method.
One achievement that can be credited to him is the Socratic method which is a teaching technique that involves asking questions and seeking answers. This method was used by the philosopher in his teaching routine where he made his students use their reasoning to learn. And by posing questions for the students' questions, he made them think and reason instead of being taught or told the direct answer to their questions and queries.
