Malik,a Child in Intensive Applied Behavior Analysis Treatment for Autism

Malik,a child in intensive applied behavior analysis treatment for autism spectrum disorder,has improved in a number of ways after four years of treatment.However,the major difficulty for his parents is the:

A) the expense of the treatment,which is offered on only an inpatient basis.
B) extraordinary time commitment involved.
C) fact that even with the treatment,he will never be able to attend a normal classroom at school.
D) fact that even with intensive treatment,his intelligence will not improve significantly.