In ancient times, due to the limitations of the level of political, economic and cultural development, libraries were not as many and so complicated as today, so the need for reference books is far less urgent than today. What is the most accurate restatement of this passage? ['Ancient political, economic, and cultural development is not as advanced as it is today.', 'Ancient politics had many restrictions on books.', 'The ancients did not need reference books.', "Ancient people's need for reference books is far less urgent than modern people's."]