The correct answer is A. The Greeks
Explanation
Ancient Greece is the civilization from 19th century BC to the 7th century AD considered as one of the most important ancient civilizations as it provided the foundation for the western culture, for Greek culture science and knowledge was as important as religion and because of this the greeks discoveries and developments in terms of science were important and included astronomy discoveries, the first model to prove the earth was sphere and the movements of it was created by the greeks Callippus of Cyzicus and Eudoxus of Cnidus in the 4th century BC, later other advancements were made including a heliocentric system by Aristarchus of Samos in the 3th century and calculations of the circunference of Earth by Eratosthenes. Because of this, the Greeks were the first culture to determine that the earth was a sphere and create multiple models and calculations related to it.
