The experiment by Johnson et al. (2010) in which infants saw a “mother” ball either move toward or away from a crying “baby” ball provided evidence that by 1 year of age, infants

a. all know that an attachment figure should move toward a crying baby.
b. make assumptions about how an attachment figure will behave when a baby is crying.
c. know that the attachment figure serves as a secure base for exploration.
d. know that they should avoid a crying baby.

Answer: b. make assumptions about how an attachment figure will behave when a baby is crying