Answer:
B. Individuals are removed from the population.
Step-by-step explanation:
The density of a population refers to the amount of people that you can find per unit area. Also, mortality refers to the number of death among population and it decreases the number of people and emigration is when people leave their country to move to another one which also decreases the population in a given place. So, according to this, mortality and emigration cause that individuals are removed from the population.