What are the differences between emerging adulthood and young adulthood?

A) Emerging adulthood typically refers to the period between ages 18 and 25, while young adulthood spans from ages 25 to 40.
B) Emerging adulthood is characterized by exploration and instability, while young adulthood is marked by stability and established identity.
C) Emerging adulthood is mainly focused on educational and career development, while young adulthood is centered around establishing long-term relationships and starting a family.
D) All of the above.