For democracy to survive, it is imperative that the average citizen be able to develop informed opinions about important policy issues. In today' s society, this means that citizens must be able to develop informed opinions on many scientific subjects, from ecosystems to defense systems. Yet, as scientific knowledge advances, the average citizen is increasingly unable to absorb enough information to develop informed opinions on many important issues. Of the following, which one follows logically from the passage? ['The survival of democracy is threatened by the advance of scientific knowledge.', 'Every citizen has a duty to and can become scientifically literate.', 'The most effective democracy is one that is the most scientifically unsophisticated.', 'Democracy will survive if there are at least some citizens who are capable of developing informed opinions on important scientific issues.']