The Wilsons note that their 6-month-old daughter Beth seems to be developing more slowly and is not as playful as other infants her age. Research suggests that

a. Beth's intelligence score will be below average in childhood but not necessarily in
adulthood.
b. Beth's intelligence score will be below average in both childhood and adulthood.
c. casual observation of Beth's behavior cannot be used to predict her later intelligence score.
d. Beth's performance intelligence score but not necessarily her verbal intelligence
score will be below average in both childhood and adulthood.
e. observations of Beth's early behavior may be highly predictive of the later
development of Down syndrome.

Answer: c. casual observation of Beth's behavior cannot be used to predict her later intelligence score.