Human life stages (earliest to latest): Arrange— a. Birth, b. Death, c. Childhood, d. Infancy, e. Adolescence, f. Adulthood, g. Old age.

Introduction / Context:
Reasoning exams often test knowledge of natural sequences like human development. The order proceeds from birth through growth and maturity to old age and death.

Given Data / Assumptions:

• Standard developmental stages: Infancy → Childhood → Adolescence → Adulthood → Old age.
• Birth initiates life; death concludes it.

Concept / Approach:
Place the fixed endpoints first (birth, death), then insert intermediate stages in pedagogically accepted order.

Step-by-Step Solution:

Verification / Alternative check:
Matches common biology/social science curricula.

Why Other Options Are Wrong:
They misplace adolescence/adulthood or position death earlier.

Common Pitfalls:
Swapping childhood and infancy; placing old age before adulthood.

Final Answer:
a, d, c, e, f, g, b