(Ch. 7) The A-not-B error refers to infants' a) persistent searches for an object at a location (A) where it was previously found, despite having observed it being hidden anew at a different location (B) b) search errors during the stage of primary circular reactions c) verbal behavior during activities that is directed toward themselves (A) rather than others (B) d) patterns of social interaction (A) and structured activity (B) during joint problem solving