Answer:
Option D, effect of a natural disaster on population size
Step-by-step explanation:
Age structure diagram is also known as population pyramid. In this, the population is grouped into different range of ages such as 0-5 years, 5-15 years, 15-30 years – 30-50 years, 50-60 years and above 60 and further grouped into male and female population. The population under each sex and age group classification is represented as vertical bars. Usually the female population is kept on right and male population is kept on left.
This pyramid is used to study the changes in the population structure based on its age group and sex. It gives no interpretation of change of size of population due to any natural disaster.
Hence, option D is correct