What nationality was the legendary mathematician Pythagoras?

Option C

Pythagoras of Samos was a famous Greek mathematician and philosopher ( c. 570 – c. 495 BC). He is known best for the proof of the important Pythagorean theorem, which is about right triangles. He started a group of mathematicians, called the Pythagoreans, who worshiped numbers and lived like monks. He had an influence on Plato.