Question

What was one of the most important

contributions of the Greek city-state of Athens?
(1) development of direct democracy
(2) diffusion of a monotheistic belief system
(3) promotion of the equality of all humans
(4) creation of a writing system using
hieroglyphics

Answer 1

"(1) development of direct democracy" was by far the most important of
contributions of the Greek city-state of Athens, but I suppose this is somewhat subjective.