One of Egypt's most important cultural accomplishments was? A. creating a writing system using hieroglyphics, B. Building an economy that used coins as money, C. Letting all people vote for their leaders, D. conquering the civilizations of Mesopotamia.

i believe its B

Explanation:

The many achievements of the ancient Egyptians include the quarrying, surveying and construction techniques that supported the building of monumental pyramids, temples, and obelisks; a system of mathematics, a practical and effective system of medicine, irrigation systems and agricultural production techniques.

answer; john locke;

answer; ///was   constructed according to a mathematical formula;