The Periods of Early Childhood Are Defined for the Most

Multiple Choice

The periods of early childhood are defined for the most part by _____________, whereas the period of early adulthood is defined for the most part by ___________.

A) social milestones such as learning to love parents; physical milestones such as menopause
B) physical milestones such as learning to walk; social milestones such as getting married
C) chronological age; biological age
D) biological age; chronological age