Three of the Following Statements About the Roles of Heredity

Three of the following statements about the roles of heredity and/or environment in intelligence are accurate. Which one is not accurate?

A) Poor nutrition in the first few years of life can adversely affect intelligence over the long run.
B) People who are genetically similar to one another tend to have more similar IQ scores than people who are unrelated.
C) Biologists working in the Human Genome Project have recently identified the chromosome that carries the "intelligence" gene.
D) On average,children's performance on intelligence tests has risen around the world,suggesting that improvements in environmental conditions enhance IQ.