In a study using the false belief task with four-year-olds of average intelligence, four-year-olds with Down syndrome, and slightly older children with autism, Baron-Cohen found that

a. only the average intelligence children passed the task.
b. both the average intelligence children and the children with Down syndrome passed the task.
c. both the average intelligence children and the children with autism passed the task.
d. all three groups of children passed the task.

b