The correct answer is D. All of the above.
Natural resources are the raw materials that are used to produce goods and services. Human capital is the knowledge, skills, and experience of the workforce. Physical capital is the machinery, equipment, and buildings that are used to produce goods and services. All of these factors contribute to economic growth.
Natural resources are important because they provide the raw materials that are used to produce goods and services. For example, oil is a natural resource that is used to produce gasoline and other fuels. Iron ore is a natural resource that is used to produce steel.
Human capital is important because it is the knowledge, skills, and experience of the workforce. A well-educated and skilled workforce is able to produce more goods and services than a workforce that is not well-educated or skilled.
Physical capital is important because it is the machinery, equipment, and buildings that are used to produce goods and services. More physical capital means that businesses can produce more goods and services.
All of these factors contribute to economic growth. Economic growth is the increase in the amount of goods and services that a country produces over time. Economic growth is important because it leads to higher standards of living.