The correct answer to this open question is the following.
Although there are no options attached, we can answer the following.
Some of the major legacies left by Ancient Greece were the following.
Of course, first and foremost, Democracy. Greek leader Cleisthenes developed the concept of Democracy, where Greek citizens could elect their rulers.
Another important legacy was philosophy. Great Greek thinkers and philosophers change the ideas of the world through their postulates. We are talking about the great Socrates, Plato, Aristotle, Pythagoras, and many more.
Architecture. Ancient Greek architecture is impressive. The best example, the Parthenon in Athens.
Drama and Comedy, the Theather, is another great legacy of ancient Greeks. And of course, the Olympic Games.
That is why it is correct that Ancient Greek people were exceptional thinkers, inventors, philosophers, and architects. Indeed, their creations became legacies that spread around the world and are still used today in different aspects of modern society.