A. Solon 594 B.C.E
Explanation: The growth of Athenian democracy was supported by Solon (in 594 BC), Cleisthenes (in 508/7 BC), and Ephialtes (in 462 BC). By dividing people into ten classes based on where they lived, rather than on their income, Cleisthenes divided the unrestricted power of the aristocracy.
