The Notion of Direct Democracy Is Quaint and Appealing,but the Actual

The notion of direct democracy is quaint and appealing,but the actual achievement of direct democracy is difficult.For example,direct democracy was possible in Athens only because the city was relatively small and because ______.

A) there was a public school system so voters were very educated
B) minor government positions were filled by appointment,not election
C) women could vote
D) Athenians had slaves to do much of their work,so the citizens were free to engage in politics directly