The Greek philosophe who tutored Alexande the Great and who espoused knowledge based on observation of phenomena in the material world was Plato. Aristotle. Socrates. Xenocrate.

The correct answer is Aristotle. Aristotle was a Greek philosopher who tutored Alexander the Great and emphasized the importance of gaining knowledge through observation and study of the natural world. He was a student of Plato and later tutored Alexander the Great. Aristotle's teachings and philosophies had a significant influence on various fields such as science, politics, and ethics.