Bob, a 5-Year-Old Boy, Is Unable to Dress Himself and Cannot

Bob, a 5-year-old boy, is unable to dress himself and cannot write his name or count to 10.Bob has a longish face with a high forehead and prominent jaw; he has lax joints and stands with flat feet.Which genetic disorder is suspected?

A) Cri du chat syndrome
B) Down syndrome
C) Fragile X syndrome
D) Prader-Willi syndrome