A nurse is assessing a 3-year-old child with autistic behaviors, an elongated facial structure, and protrusion of the ears. The nurse suspects that the child may have which of the following syndromes?

A. Trisomy 21, or Down syndrome, typically presents with features like intellectual disability, a flat facial profile, upward slanting eyes, and a small mouth. The elongated facial structure and ear protrusion are not characteristic of this condition. B. Fragile X syndrome is associated with developmental delays, autistic behaviors, and distinct physical features such as a long face, large ears, and a prominent jaw. These characteristics are consistent with the child’s presentation. C. Turner’s syndrome primarily affects females and is characterized by short stature, webbed neck, and gonadal dysgenesis, but it does not typically involve autistic behaviors or elongated facial features. D. Williams syndrome involves a distinct set of features including a broad forehead, short nose, and full lips. It is not primarily associated with elongated facial features and ear protrusion.