Which of the following statements best characterizes the impact of agriculture on different regions of the world?
a.
agriculture has had a major impact on all regions of the civilized world.
b.
regions of the world that are best suited to growing cash crops, such as wheat and corn, receive the most economic benefit.
c.
poor regions of the world benefit most from agriculture, because it serves as a substitute for high-tech industry.
d.
tropical regions of the world have benefited the most from agriculture because their climates are best suited for growing large amounts of high-value crops.