The correct chronological order of the Greek philosophers listed is option 2: 3 - 4 - 2 - 1.

To understand the correct order, let`s individually analyze each philosopher:

1. Pythagoras: Pythagoras was a mathematician, known for his theorem in geometry. He lived around the 6th century BC.

2. Socrates: Socrates was a philosopher known for his Socratic method of question and answer. He lived in the 5th century BC.

3. Plato: Plato was a student of Socrates and a philosopher himself. He lived in the 4th century BC.

4. Aristotle: Aristotle was a student of Plato and is considered one of the greatest philosophers in history. He lived in the 4th century BC as well.

Based on the above analysis, we can conclude that Pythagoras came first, followed by Socrates, then Plato, and finally Aristotle. Therefore, the correct chronological order is 3 - 4 - 2 - 1.