Correct Option: D Explanation of Why Option D is Correct: Population growth is fundamentally determined by the changes in the number of individuals in a population over a specific period. This change can be influenced by several factors, primarily birth rates, death rates, and migration patterns (both immigration and emigration).

1. Understanding the Components:
2. Birth Rate: This is the number of live births per 1,000 people in a population per year. It contributes positively to population growth.
3. Death Rate: This is the number of deaths per 1,000 people in a population per year. It contributes negatively to population growth.
4. Immigration Rate: This refers to the number of people moving into a population from other areas. It adds to the population.
5. Emigration Rate: This is the number of people leaving a population to live elsewhere. It subtracts from the population.
6. Population Growth Formula: The formula for calculating population growth can be expressed as: [ \text{Population Growth} = (\text{Birth Rate} - \text{Death Rate}) + (\text{Immigration Rate} - \text{Emigration Rate}) ] This can be simplified to: [ \text{Population Growth} = \text{Birth Rate} - \text{Death Rate} + \text{Immigration Rate} - \text{Emigration Rate} ] In the context of the options provided, this aligns with Option D: [ \text{Population Growth} = \text{Birth Rate} - \text{Death Rate} - \text{Emigration Rate} + \text{Immigration Rate} ]
7. Why Other Options Are Incorrect:
8. Option A: "Birth rate + death rate + migration rate + immigration rate"
   • This option incorrectly adds the death rate, which should be subtracted as it decreases the population. Additionally, it does not differentiate between emigration and immigration, leading to an inaccurate representation of population change.
9. Option B: "Birth rate – death rate + migration rate - immigration rate"
   • This option incorrectly adds migration rate without specifying whether it refers to immigration or emigration. It also subtracts immigration, which should actually contribute positively to population growth.
10. Option C: "Birth rate + death rate – migration rate + immigration rate"
    • This option incorrectly adds the death rate, which should be subtracted. It also does not clarify the nature of migration, leading to confusion about whether it is adding or subtracting from the population.

Summary of Key Points:

• Population Growth Calculation: Population growth is calculated by considering births, deaths, and migration (both immigration and emigration).
• Correct Formula: The correct formula is: [ \text{Population Growth} = \text{Birth Rate} - \text{Death Rate} + \text{Immigration Rate} - \text{Emigration Rate} ]
• Importance of Components: Each component plays a crucial role in determining the overall change in population size.
• Common Pitfalls: Misunderstanding the roles of death rates and migration types can lead to incorrect calculations of population growth.

This thorough understanding of how population growth is calculated will help you accurately analyze demographic changes in various contexts.