Option D is correct because the textbook explicitly states that local governments, especially Gram Sabhas, are considered the closest examples of direct democracy. In direct democracy, citizens directly participate in day-to-day decision-making and in the running of the government. The ancient city-states in Greece were examples of direct democracy. Gram Sabhas allow citizens to directly participate in making decisions rather than through elected representatives. The other options do not fit: family discussions are private matters, electing a class monitor involves choosing a representative (indirect democracy), selecting a party candidate is an internal party process, and media opinion polls are merely information-gathering exercises, not actual decision-making by citizens.