Answer:
D. Poor citizens had a voice in the government.
Step-by-step explanation:
For one, A is incorrect as the point of the democracy was to overthrow the oligarchy. B is also wrong; women didn't get the right to vote until 1893 (or 1838 (Pitcairn Islands) if you count colonies.) when New Zealand passed a law allowing that. C is wrong as well; although it WAS a democracy, that didn't necessarily mean free slaves (they were the lowest level in Athens after all). With that, only D is left, and thus is the answer to this question.