Which Best Describes Poverty's Effect on Intelligence and Achievement

Which best describes poverty's effect on intelligence and achievement?

A) Poverty has been shown to have a negligible effect on intelligence and achievement.
B) Children from wealthier homes score higher on IQ and achievement tests than do children from poorer homes.
C) Children raised in poverty face insurmountable barriers to achievement and growth in intelligence.
D) Poverty plays a role in intelligence and achievement, but not in the developed world.