Which type of history is most likely to be passed down orally to each generation? a. social histories b. intellectual histories c. cultural histories d. family histories?

The correct choice is “family histories".
other all types "Social", "intellectual", or "cultural" histories have their ways of preservation, either in written records or in material forms but "family history" passes on from one generation to another, very rarely written down though some families when on a significant cultural or religious standard preserve their histories.