According the Hardwired to Connect, Nurturing Environments Affect Gene Transcription

According the Hardwired to Connect, nurturing environments affect gene transcription and the development of brain circuitry. What evidence do they provide to support this claim?

A) Well-mothered rat pups are predisposed at the celluar leve to pass on good nurturing to the next generation.
B) Bowlby's attachment theory and Ainsworth's research suggest that good mothering changes the oxytocin and vasopressin levels in the brain.
C) Harlow's study with monkeys showed that baby monkeys nurtured by a "rag" mother were just as likely to be better parents to their offspring as monkeys nurtured by "live" mothers.