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

Answer: a, low birth to death ratio
Explanation: immigration adds more population, and when resources are abundant, people do better. a high birth to death ratio would mean more people are being made.
Answer:
a low birth to death ratio
Explanation:
If you have a small amount of people being born, and a high amount of people dying, your population would shrink.
You can have 2,000 born every day in a country, but if 2,500 die every day, that will not help you.