Question

however, studies of adopted children show that adoptees show some similarity in iq both to their adoptive parents and to other children raised in the same household who are unrelated to them. in fact, a french study showed that transferring babies from impoverished households to wealthy ones improved childhood iq scores by 12 to 16 points.
a suggest that children who are adopted do not have genetic similarities to the iq of their adoptive parents
b say that poor people are often less intelligent than rich people
c demonstrate that intelligence can be increased or decreased by a childs home and family
d prove that iq doesnt mean anything because it can be affected by changes in environment

Explanation:

The passage shows that adoptees' IQ is related to their adoptive - family environment, and moving babies from poor to wealthy households can improve IQ scores. This indicates that a child's home and family can influence intelligence. Option A is not the main point as the focus is on environmental influence rather than lack of genetic similarity. Option B is an over - generalization and not the main idea. Option D is too extreme as it doesn't mean IQ is meaningless just because it can be affected by the environment.

Answer:

C. demonstrate that intelligence can be increased or decreased by a child's home and family