River Has a Round Face,a Flattened Skull,an Extra Fold of Skin

Multiple Choice

River has a round face,a flattened skull,an extra fold of skin over her eyelids,a thickened tongue,short limbs,and retardation of motor and mental abilities.She is likely to have been born with:

A) Fragile X syndrome.
B) Klinefelter syndrome.
C) Down syndrome.
D) XYY syndrome.