A Friend Tells You That He Is Nervous Because He

A friend tells you that he is nervous because he has heard that intelligence is genetic, and he thinks his parents are not all that intelligent (not as intelligent as he hopes himself to be) . Based on what you know of the research by Plomin, you tell him:

A) not to worry since intelligence is affected by how much one knows and what people today know is significantly greater than what our parents know
B) not to worry because inheritance plays absolutely no factor in intelligence
C) to seriously think about gene therapy
D) to stop worrying since genes affect less than 5% of the variance in IQ