Final answer:
The most relevant quote supporting the statement that genetics and environment both influence intelligence is that the best-performing students often come from families with intelligent parents and children, underlying a heritable component.
Step-by-step explanation:
Identifying the Strongest Support for a Statement on Intelligence
Choosing the quote which most strongly supports the correct answer to a question relating to intelligence requires critical evaluation of the source material. The quote that appears the most relevant in indicating a genetic and environmental influence on intelligence is: "Most of the students who perform best in my high school come from families where both parents and children are intelligent." This statement could suggest that there is a heritable component to intelligence, which aligns with the idea that intelligence is influenced by a combination of genetic factors and environmental stimulation.
From the context provided, we understand that intelligence is a complex trait that is affected by both genetics and the environment, as found in twin studies and learning disabilities research. There is evidence refuting a biological-racial basis for intelligence and an acknowledgment of the socioeconomic factors that can influence intellectual development.