Which of the following conditions would lead to a small population size?

a.) a low birth to death ratio

b.) a high birth to death ratio

c.) immigration

d.) large number of resources

I think the correct answer from the choices listed above is option A. The condition that would lead to a small population size is a low birth to death ratio. This means that more people are dying than the rate of giving birth which consequently lead to smaller number of people in an area.