Correct Answer: 4. A, B, C, D, E only
Solution:The age-sex structure of a population is influenced by demographic and migratory factors that alter the distribution of people by age and gender. These include:
A. Birth: Determines the number of young people entering the population.
B. Death: Affects age distribution, especially at older ages.
C. Age-selective internal migration: Movement of certain age groups (e.g., working-age adults) changes age composition.
D. Age-sex selective internal migration: Adds gender dimension-e.g., male-dominated labor migration or female-dominated marriage migration.
E. International migration: Alters both age and sex composition, depending on the demographic profile of migrants.
Thus, all five factors affect the age-sex structure of India's population.