Answer: Option B) individuals moving from one region of the country to another region of the same country.
Step-by-step explanation:
All the other options affect the size of population in that:
- increased death rate
It reduces the total number of individuals living at a point in time
- individuals moving from this country to another country i.e Emigration
Of course, the total number of individuals reduces as some move out of a country
- increased birth rate
This raises the total number of individuals living at a point in time.
On the other hand, the distribution of individuals in a population is affected by the movement from one region of the country to another region of the same country. For instance: the movement from rural areas to urban areas affects only the distribution of people not the size of the population.