The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Who are the most important and famous philosophers from ancient Greece?
The most important philosophers from ancient Greece were Socrates, Plato, and Aristotle.
Socrates was the ultimate master professor in Athens, Greece. He taught his wisdom in a place called "Agora." There, he was the teacher of Plato. Socrates taught Plato and other students the Mayeutics teaching, to question everything having a question for every answer.
Socrates was sentenced to death. He was found guilty of questioning the Greek religion and the power of the Greek gods.
Plato was the teacher of Aristotle. Plato taught Aristotle elevated concepts about morality, equality, justice, and beauty through dialectics. Both teacher and student discussed epistemology, cosmology, theology, and politics.