Which of the Following Statements Illustrates Evidence for Autism Having

Which of the following statements illustrates evidence for autism having a hereditary component?

A) "Refrigerator mothers "have been shown to have had mothers who were also "cold" and uninvolved.
B) Identical twins are much more likely to both have autism than are fraternal twins.
C) When one family member has autism,the chances are 9.3 times higher that a first cousin has autism than in the population as a whole.
D) Family members of those with autism are less likely to have a preference for routines than people in general.