Sarah Is the Mother of Seven-Year-Old Adam

Sarah is the mother of seven-year-old Adam. She often brags that her son has the mental abilities typical of a 14-year-old. Sarah is so certain of Adam's high intellect that she is trying to read as she can about intelligence because she hopes to help her son reach his full potential.
-Sarah was reading a book about Galton's theory of intelligence and she became transfixed.What would Galton attribute Adam's intelligence to

A) Adam was brought up in an enriched environment and had access to superior schooling.
B) Adam's parents also have above average intelligence and it is in his genes.
C) A combination of genetics and enriched environment working together.
D) Generational changes have increased his performance in IQ test (i.e., the Flynn effect) .