The influence of genes on intelligence depends on one's environment. Which of the following is an example of the interaction between one's genetics and environment?
a) Monozygotic twins have more similar IQs in high-SES environments than they do in impoverished environments.
b) The Flynn effect has been documented in impoverished countries but not in more modernized countries.
c) Once a child is raised in an impoverished environment, the negative effect on intelligence is permanent.
d) Recent evidence indicates a generation-to-generation decrease in the Flynn effect for people at the middle to upper end of the IQ range.