In His Orphanage Study, What Difference Did Spitz Find Between

In his orphanage study, what difference did Spitz find between babies who were properly socialized and those who were not?

A) The older the children were, the more social interaction they required.
B) Those children who received more interaction tended to be more emotionally unstable.
C) Those children who received less social interaction tended to be more withdrawn and susceptible to physical illness.
D) There was little difference found between children who received social interaction and those who had not.