24. Children whose biological parents both have Tic

　　Syndrome Z (TSZ), which is characterized by the

　　involuntary contraction of certain muscles, are about

　　four times more likely to develop such contractions

　　than are children whose biological parents do not

　　have TSZ, It is likely, therefore, that predisposition

　　to TSZ is an inherited trait.

　　Which of the following, if true, would most strengthen

　　the conclusion above?

　　(A) Children whose parents have TSZ are more

　　likely to develop TSZ if they are under unusual

　　stress at school or at home than if they are not

　　under such stress.

　　(B) Children whose biological parents do not have

　　TSZ are more likely to develop TSZ if they are

　　raised by adoptive parents with TSZ than if

　　they are raised by their biological parents.

　　(C) Children whose biological parents have TSZ are

　　as likely to develop TSZ if they are raised by

　　adoptive parents who do not have TSZ as if

　　they are raised by their biological parents.

　　(D) Children whose biological parents have TSZ and

　　who develop TSZ usually avoid developing a

　　severe form of the syndrome if they seek

　　treatment for TSZ shortly after developing the

　　first signs of it.

　　(E) Children with TSZ whose biological parents do

　　not have TSZ are less likely to have the syn-

　　drome diagnosed when symptoms first appear

　　than are children with TSZ whose biological

　　parents have TSZ.