Two Friends Are Debating About the Nature of IQ

Multiple Choice

Two friends are debating about the nature of IQ.Sam claims that it measures innate abilities.Joseph says that it is influenced strongly by environmental factors.Which of the following could Joseph truthfully use to support his arguments?

A) It has been estimated that IQ can vary up to 15 points depending on environment.
B) Identical twins raised together tend to have similar IQs.
C) It is likely that two unrelated people raised in different environments will have different IQs.
D) Adopted children have IQs that are similar to those of children who have stayed with their natural lower-class parents.