A Mother Hands Her Baby a Rattle, Saying, "Here You

Multiple Choice

A mother hands her baby a rattle, saying, "Here you are." She then gently takes the rattle away, smiling and saying, "Thank you." She does this repeatedly, letting the baby keep the rattle for several seconds each time and encouraging the baby to offer the rattle. Eventually, the baby takes the rattle, holds it for a few seconds, and then holds it out to her mother and smiles. This is an example of

A) sociability.
B) scaffolding.
C) emotionality.
D) reciprocal socialization.