Which of the following statements about autism is correct?

A. Autistic children seek out social contact

B. Verbal communication is impaired, while nonverbal expression is normal

C. About one in every 1,500 children will develop symptoms of autism

D. It usually appears within the first three years of life

either d or c.q couldn't be b because there are different autism spectrum like some kids are better at speach than others

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !