Which of the Following Is Not True of Williams Syndrome

Which of the following is not true of Williams Syndrome?

A) Poor numerical skills and high reading ability are typical of those with Williams syndrome.
B) Williams syndrome patients tend to have uncommon ability to create and imitate music.
C) Most are diagnosed during mid-adulthood,after the genetic material has been passed on to their children.
D) Symptoms include abnormal posture,gait,and facial features.