Arrange human life stages in biological/psychosocial order from earliest to latest: Labels: 1. Adulthood 2. Infancy 3. Childhood 4. Adolescence

Introduction / Context:
This item asks for a chronological progression of life stages. In broad educational taxonomy, infants develop into children, children into adolescents (puberty and teen years), and adolescents become adults. We must map that story to the numbered labels given.

Given Data / Assumptions:

• 2 = Infancy (earliest period after birth).
• 3 = Childhood (pre-puberty development).
• 4 = Adolescence (pubertal transition to maturity).
• 1 = Adulthood (mature stage).

Concept / Approach:
Order strictly by age progression, not by social roles or legal definitions. The biologically and psychologically accepted sequence is Infancy → Childhood → Adolescence → Adulthood.

Step-by-Step Solution:

Verification / Alternative check:
Any sequence that places adulthood before adolescence contradicts age development; placing adolescence before childhood also breaks biological order.

Why Other Options Are Wrong:

• 1,3,4,2 and 1,2,3,4: Begin with adulthood—chronologically impossible.
• 2,4,3,1: Swaps adolescence and childhood.

Common Pitfalls:
Overthinking edge cases (e.g., legal adulthood vs biological maturity). The question asks a general developmental order.

Final Answer:
2, 3, 4, 1