Answer: B. Emerging adulthood
Explanation: Adolescence is typically divided into three main periods: early adolescence, middle adolescence, and later adolescence. However, emerging adulthood is not considered one of the periods of adolescence.
Early adolescence generally refers to the ages of 10 to 14, when individuals undergo significant physical, emotional, and social changes. Middle adolescence typically spans from ages 15 to 17, while later adolescence encompasses ages 18 to 21.
On the other hand, emerging adulthood is a separate developmental stage that occurs between adolescence and full adulthood. It typically encompasses the ages of 18 to 25, and is characterized by exploration, self-discovery, and transitions into adulthood, such as attending college, starting a career, and establishing independence.
To summarize, while early adolescence, middle adolescence, and later adolescence are periods of adolescence, emerging adulthood is not considered one of these periods.