Refer to the Figure Below

Multiple Choice

Refer to the figure below.
Which of the following is a valid conclusion from the data in the figure?

A) There is a correlation between IQ scores and levels of lead found in the blood.
B) People inherit genes that make them healthier and improve their IQ scores.
C) Environmental factors have a much greater effect on IQ scores than heredity.
D) Children who are exposed to lead have smaller brains than children who are not exposed to lead.