What Have the Results of Behavioural Treatment Targeting the Socialization

What have the results of behavioural treatment targeting the socialization deficits of individuals with autism spectrum disorder shown?

A) some improvement in the quality of socialization but little improvement in the quantity of social contacts
B) some improvement in quantity of socialization but little improvement in the quality of social contacts
C) no improvement
D) substantial improvement in both the quantity and quality of social contacts